The 2010 United States Senate election in California took place on November 2, 2010. The election was held alongside 33 other United States Senate elections in addition to congressional, state, and various local elections. Incumbent Democratic U.S. Senator Barbara Boxer won re-election to a fourth term.
November 2, 2010 | |||||||||||||||||
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Boxer: 40–50% 50–60% 60–70% 70–80% 80–90% Fiorina: 40–50% 50–60% 60–70% 70–80% | |||||||||||||||||
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Democratic primary
Candidates
- Barbara Boxer, incumbent U.S. Senator
- Mickey Kaus, journalist and blogger
- Brian Quintana, businessman and educator
Campaign
In 2009, Boxer was criticized for correcting a general who called her "ma'am". Brigadier General Michael Walsh was testifying on the Louisiana coastal restoration process in the wake of Hurricane Katrina and answered Boxer's query with "ma'am" when Boxer interrupted him. "Do me a favor," Boxer said. "can you say 'senator' instead of 'ma'am?'" "Yes, ma'am," Walsh interjected. "It's just a thing, I worked so hard to get that title, so I'd appreciate it. Thank you," she said. The Army's guide to protocol instructs service members to call members of the U.S. Senate "sir", "ma'am" or "senator". Fiorina used this incident prominently in campaign ads, as did David Zucker, who directed a humorous commercial for RightChange.com titled 'Call Me Senator'.
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Barbara Boxer (incumbent) | 1,957,920 | 81.0 | |
| Democratic | Brian Quintana | 338,442 | 13.9 | |
| Democratic | Mickey Kaus | 123,573 | 5.1 | |
| Total votes | 2,419,935 | 100.0 | ||
Republican primary
Candidates
- Tom Campbell, former U.S. representative from Silicon Valley (1989–93 and 1995–2001) and candidate for Senate in 1992 and 2000
- Chuck DeVore, state assemblyman from Irvine (2004–10)
- Carly Fiorina, former CEO of Hewlett-Packard
- Tim Kalemkarian
- Al Ramirez, businessman
Declined
- Arnold Schwarzenegger, governor of California since 2003
Campaign
Through 2009, the race largely shaped up as a campaign between former Hewlett-Packard executive Carly Fiorina and Irvine assemblyman Chuck DeVore. In November 2009, the Los Angeles Times reported that Fiorina had failed to vote in most elections. Fiorina apologized by saying, "I'm a lifelong registered Republican but I haven't always voted, and I will provide no excuse for it. You know, people die for the right to vote. And there are many, many Californians and Americans who exercise that civic duty on a regular basis. I didn't. Shame on me."
In January 2010, Tom Campbell joined the race. He had previously been running for governor and had run unsuccessful campaigns for Senate in 1992 and 2000. Campbell led in initial public polling over Fiorina and DeVore. However, his campaign declined after sustained negative attacks from Fiorina and controversy over his past support for and association with Sami Al-Arian.
In February, Fiorina put out a campaign ad attacking Campbell as a wolf in sheep's clothing for his relatively liberal voting record. The ad, which became known as the Demon Sheep ad, gained international, mostly negative, publicity for its bizarre visuals, including a man in a sheep costume with glowing red eyes.
Fiorina was more successful in attacking Campbell in February over his associations with Sami Al-Arian, a computer engineering professor at the University of South Florida who had pleaded guilty in 2006 after a lengthy trial for conspiracy to help the Palestinian Islamic Jihad, a designated terrorist group. In 2000, Campbell had received campaign contributions from Al-Arian, and in January 2002, Campbell wrote a letter opposing academic discipline for Al-Arian.
Campbell initially denied that he had received contributions from Al-Arian, which proved to be untrue. He defended the letter by arguing that he had not been aware of the charges against Al-Arian when he wrote it and had also not been aware of comments Al-Arian had recorded in Cleveland, Ohio in 1988, when he shouted, "Jihad is our path. Victory to Islam. Death to Israel." Al-Arian had previously defended the remarks on a September 26, 2001 episode of The O'Reilly Factor; Campbell initially claimed that his letter had been sent before the O'Reilly interview, but Al-Arian was placed on initial academic leave shortly after the interview. Despite this, Campbell maintained,
I did not hear, I did not read, I was not aware of statements Sami Al-Arian had made relative to Israel. And I would not have written the letter had I known about those. ... To say 'Death to Israel' is abhorrent; it's horrible.
As a result of his Al-Arian associations, Fiorina accused Campbell of being unfriendly to the interests of Israel. In late February, former California Secretary of State and state senator Bruce McPherson claimed that Fiorina campaign manager Marty Wilson, a longtime Sacramento political operative, had called Campbell an antisemite and expressed surprise that McPherson was endorsing Campbell. Wilson strongly denied McPherson's charge.
A live March 5 debate between the three main candidates was hosted by KTKZ in Sacramento and focused on the issue at Campbell's behest. Campbell responded strongly to Fiorina's accusations, saying, "I called for this debate today so that both of my opponents can bring up absolutely any charge they want. Air it, and let me respond to it. But there's no place for calling me antisemitic, then denying it. That whispering campaign, that 'silent slander,' stops today." Campbell maintained that he had not been aware of Al-Arian's statements and attributed his earlier inaccurate claims to failures of memory, but he apologized for not researching the matter more thoroughly before writing the letter.
After the March debate, Campbell appeared to maintain his lead in polling, with polls throughout the spring showing him leading Fiorina in the primary and leading or even with Boxer in the general election. However, Fiorina surged into the lead in May after dedicating a significant portion of her personal fortune, including a $5.5 million loan to her campaign, to a late advertising push. She additionally secured the endorsement of Alaska governor and 2008 vice presidential nominee Sarah Palin, who remained popular with rank-and-file Republican voters.
Polling
| Poll source | Date(s) administered | Sample size | Margin of error | Tom Campbell | Carly Fiorina | Chuck DeVore | Other | Undecided |
|---|---|---|---|---|---|---|---|---|
| The Field Poll (report) | Feb. 20 – March 1, 2009 | 298 | ±3.6% | — | 31% | 19% | — | 36% |
| The Field Poll (report) | Sept. 18 – October 6, 2009 | 373 | ±4.5% | — | 21% | 20% | — | 59% |
| Los Angeles Times (report) | Oct. 27 – November 3, 2009 | 499 | — | — | 27% | 27% | 2% | 40% |
| The Field Poll (report) | January 5–17, 2010 | 202 | ±7.1% | 30% | 25% | 6% | — | 39% |
| PPIC (report) | January 27, 2010 | 2,001 | ±2.0% | 27% | 16% | 8% | 1% | 48% |
| M4 Strategies (report) | February 26, 2010 | 427 | — | 32% | 19% | 11% | — | 39% |
| Research 2000 (report) | March 10, 2010 | 400 | ±5.0% | 33% | 24% | 7% | — | 36% |
| PPIC (report) | March 24, 2010 | 2,002 | ±2.0% | 23% | 24% | 8% | 1% | 44% |
| Los Angeles Times (report) | March 23–30, 2010 | 1,515 | ±2.6% | 29% | 25% | 9% | 4% | 33% |
| Survey USA (report) | April 19–21, 2010 | 538 | ±4.3% | 34% | 27% | 14% | 3% | 23% |
| Survey USA (report) | May 6–9, 2010 | 548 | ±4.3% | 35% | 24% | 15% | 3% | 23% |
| Research 2000 (report) | May 17–19, 2010 | 400 | ±5.0% | 37% | 22% | 14% | — | 27% |
| PPIC (report) | May 9–16, 2010 | 1,168 | ±3.0% | 23% | 25% | 16% | — | 36% |
| Public Policy Polling (report) | May 21–23, 2010 | 417 | ±4.8% | 21% | 41% | 16% | — | 18% |
| Survey USA (report) | May 21–23, 2010 | 612 | ±4.3% | 23% | 46% | 14% | 6% | 11% |
| Los Angeles Times (report) | May 19–26, 2010 | 1,506 | ±2.6% | 23% | 38% | 16% | 23% | |
| Survey USA (report) | June 3–6, 2010 | 569 | ±4.2% | 22% | 48% | 16% | 9% | |
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Carly Fiorina | 1,315,429 | 56.4 | |
| Republican | Tom Campbell | 504,289 | 21.7 | |
| Republican | Chuck DeVore | 452,577 | 19.3 | |
| Republican | Al Ramirez | 42,149 | 1.8 | |
| Republican | Tim Kalemkarian | 19,598 | 0.8 | |
| Total votes | 2,334,042 | 100.0 | ||
Third party primaries
Candidates
American Independent
- Don Grundmann, chiropractor and American Independent nominee for the U.S. Senate in 2006
- Edward Noonan, small-business owner
- Al Salehi, political analyst
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| American Independent | Edward Noonan | 16,704 | 39.5 | |
| American Independent | Don Grundmann | 14,170 | 33.5 | |
| American Independent | Al Salehi | 11,423 | 27.0 | |
| Total votes | 42,297 | 100.0 | ||
Green
- Duane Roberts, community volunteer
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Green | Duane Roberts | 19,983 | 100.00% | |
| Total votes | 19,983 | 100.0 | ||
Libertarian
- Gail Lightfoot, retired nurse
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Libertarian | Gail Lightfoot | 17,791 | 100.00% | |
| Total votes | 17,791 | 100.0 | ||
Peace and Freedom
- Marsha Feinland, retired teacher and Peace and Freedom nominee for president in 1996
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Peace and Freedom | Marsha Feinland | 4,070 | 100.00% | |
| Total votes | 4,070 | 100.0 | ||
General election
Candidates
The following were certified by the California Secretary of State as candidates in the general election for Senator.
- Barbara Boxer (Democratic), incumbent U.S. Senator
- Carly Fiorina (Republican), former CEO of Hewlett-Packard
- Edward Noonan (American Independent Party), small business owner
- Duane Roberts (Green), community volunteer
- Gail Lightfoot (Libertarian), retired nurse
- Marsha Feinland (Peace and Freedom), retired teacher and Peace and Freedom nominee for president in 1996
Campaign
Boxer criticized Fiorina's choice "to become a CEO, lay off 30,000 workers, ship jobs overseas [and] have two yachts." A spokesman for Fiorina responded that the Fiorinas were a two-yacht family because they spent time in both California and Washington, D.C. Boxer also claimed that Fiorina "skirted the law" by selling equipment to Iran during her tenure as HP's CEO, also claiming that the equipment may have ended up in the hands of the Iranian military.
Debate
The only debate took place on September 1 at Saint Mary's College of California in Moraga. It was sponsored by San Francisco Chronicle, KTVU, and KQED.
| No. | Date | Host | Moderator | Link | Democratic | Republican |
|---|---|---|---|---|---|---|
| Key: P Participant A Absent N Not invited I Invited W Withdrawn | ||||||
| Boxer | Fiorina | |||||
| 1 | Sep. 1, 2010 | KQED-FM KTVU San Francisco Chronicle | Randy Shandobil | C-SPAN | P | P |
Predictions
| Source | Ranking | As of |
|---|---|---|
| Cook Political Report | Tossup | October 26, 2010 |
| Rothenberg | Tilt D | October 22, 2010 |
| RealClearPolitics | Tossup | October 26, 2010 |
| Sabato's Crystal Ball | Lean D | October 21, 2010 |
| CQ Politics | Lean D | October 26, 2010 |
Polling
| Poll source | Date(s) administered | Sample size | Margin of error | Barbara Boxer (D) | Carly Fiorina (R) | Other | Undecided |
|---|---|---|---|---|---|---|---|
| The Field Poll (report) | Feb. 20 – March 1, 2009 | 761 | ± 3.6% | 55% | 25% | — | 20% |
| Rasmussen Reports (report) | March 9, 2009 | 500 | ± 4.5% | 47% | 38% | 10% | 5% |
| Rasmussen Reports (report) | July 22, 2009 | 500 | ± 4.5% | 45% | 41% | 7% | 7% |
| Research 2000 (report) | August 9–12, 2009 | 600 | ± 4.0% | 52% | 31% | — | 17% |
| Rasmussen Reports (report) | September 23, 2009 | 500 | ± 4.5% | 49% | 39% | 4% | 8% |
| The Field Poll (report) | Sept. 18 – October 6, 2009 | 1,005 | ± 3.2% | 49% | 35% | — | 16% |
| Rasmussen Reports (report) | November 17, 2009 | 500 | ± 4.5% | 46% | 37% | 5% | 12% |
| Rasmussen Reports (report) | January 14, 2010 | 500 | ± 4.5% | 46% | 43% | 3% | 8% |
| The Field Poll (report) | January 5–17, 2010 | 1,005 | ± 3.2% | 50% | 35% | — | 15% |
| PPIC (report) | January 27, 2010 | 2,001 | ± 2.0% | 48% | 40% | — | 12% |
| Rasmussen Reports (report) | February 11, 2010 | 500 | ± 4.5% | 46% | 42% | 7% | 5% |
| Research 2000 (report) | March 10, 2010 | 600 | ± 4.0% | 49% | 40% | — | 11% |
| Rasmussen Reports (report) | March 11, 2010 | 500 | ± 4.5% | 46% | 40% | 4% | 10% |
| The Field Poll (report) | March 18, 2010 | 748 | ± 3.7% | 45% | 44% | — | 11% |
| PPIC (report) | March 24, 2010 | 2,002 | ± 2.0% | 44% | 43% | — | 13% |
| Rasmussen Reports (report) | April 12, 2010 | 500 | ± 4.5% | 42% | 38% | 7% | 13% |
| Rasmussen Reports (report) | May 12, 2010 | 500 | ± 4.5% | 45% | 38% | 4% | 12% |
| PPIC (report) | May 9–16, 2010 | 2,003 | ± 2.0% | 48% | 39% | — | 13% |
| Research 2000 (report) | May 17–19, 2010 | 600 | ± 4.0% | 48% | 39% | — | — |
| Los Angeles Times (report) | May 19–26, 2010 | — | — | 44% | 38% | — | — |
| Public Policy Polling (report) | May 21–23, 2010 | 921 | ± 3.2% | 45% | 42% | — | 13% |
| Rasmussen Reports (report) | June 9, 2010 | 500 | ± 4.5% | 48% | 43% | 5% | 5% |
| Reuters (report) | June 30, 2010 | 600 | ± 4.5% | 45% | 41% | 1% | 13% |
| Survey USA (report) | July 8–11, 2010 | 614 | ± 4.0% | 45% | 47% | 3% | 5% |
| Rasmussen Reports (report) | July 12, 2010 | 500 | ± 4.5% | 49% | 42% | 4% | 5% |
| Public Policy Polling (report) | July 23–25, 2010 | 614 | ± 3.95% | 49% | 40% | — | 11% |
| Rasmussen Reports (report) | August 3, 2010 | 750 | ± 4.0% | 45% | 40% | 5% | 10% |
| Survey USA/CBS 5 (report) | August 9–11, 2010 | 602 | ± 4.0% | 42% | 47% | — | 11% |
| Rasmussen Reports (report) | August 24, 2010 | 750 | ± 4.0% | 44% | 43% | 5% | 8% |
| Survey USA (report) | August 31 – September 1, 2010 | 569 | ± 4.2% | 46% | 48% | 5% | 1% |
| CNN(report Archived September 9, 2010, at the Wayback Machine) | September 2–7, 2010 | 866 | ± 3.5% | 48% | 44% | 5% | 3% |
| Rasmussen Reports (report) | September 6, 2010 | 750 | ± 4.0% | 42% | 47% | — | — |
| Rasmussen Reports (report) | September 6, 2010 | 750 | ± 4.0% | 47% | 48% | 2% | 3% |
| Fox News (report) | September 11, 2010 | 1,000 | ± 3.0% | 46% | 44% | 4% | 6% |
| Public Policy Polling (report) | September 14–16, 2010 | 630 | ± 3.9% | 50% | 42% | — | 8% |
| Fox News/Pulse Opinion Research (report) | September 18, 2010 | 1,000 | ± 3.0% | 47% | 46% | 3% | 4% |
| Rasmussen Reports (report) | September 20, 2010 | 750 | ± 4.0% | 47% | 43% | 4% | 6% |
| Survey USA (report) | September 19–21, 2010 | 610 | ± 4.0% | 49% | 43% | 6% | 2% |
| CNN/Time/Opinion Research Corporation (report) | September 24–28, 2010 | 786 | ± 3.5% | 52% | 43% | 3% | 2% |
| PPIC report | September 19–26, 2010 | 1,104 | ± 3% | 42% | 35% | 6% | 17% |
| USC poll report | September 27, 2010 | 1,003 | — | 39% | 34% | — | 23% |
| Rasmussen Reports (report) | October 3, 2010 | 750 | ± 4.0% | 49% | 45% | 2% | 5% |
| Angus Reid Public Opinion (report) | October 6, 2010 | 501 | ± 4.5% | 55% | 39% | 6% | — |
| Rasmussen Reports (report) | October 13, 2010 | 750 | ± 4.0% | 49% | 46% | 2% | 3% |
| Reuters (report) | October 12–14, 2010 | 601 | ± 4.0% | 46% | 45% | 2% | 6% |
| PPIC (report) | October 10–17, 2010 | 1,067 | ± 3.5% | 43% | 38% | 6% | 13% |
| Tarrance Group (report) | October 17–19, 2010 | — | ± 4.1% | 44% | 44% | 6% | 5% |
| USC/LA Times (report) | October 13–20, 2010 | 878 | ± 3.2% | 50% | 42% | 4% | 4% |
| Rasmussen Reports (report) | October 21, 2010 | 750 | ± 4.0% | 48% | 46% | 3% | 3% |
| Public Policy Polling (report) | October 21–23, 2010 | 622 | ± 3.2% | 52% | 43% | 0% | 5% |
| Fox/Pulse Opinion Research (report) | October 23, 2010 | 1,000 | ± 3.0% | 48% | 44% | 5% | 3% |
| Suffolk University (report Archived November 4, 2010, at the Wayback Machine) | October 21–24, 2010 | 600 | ± 4.0% | 52% | 43% | 4% | 2% |
| SurveyUSA (report) | October 21–25, 2010 | 594 | ± 4.1% | 45% | 40% | 7% | 8% |
| Field Poll (report) | October 14–26, 2010 | 1,501 | ± 3.2% | 49% | 41% | — | 10% |
| CNN/Time/Opinion Research (report) | October 20–26, 2010 | 1,527 | ± 2.5% | 50% | 45% | 1% | — |
| Rasmussen Reports (report) | October 27, 2010 | 750 | ± 4.0% | 49% | 46% | 2% | 3% |
| Angus Reid Public Opinion (report) | October 28–29, 2010 | 485 | ± 4.5% | 51% | 44% | 5% | — |
| SurveyUSA (report) | October 26–31, 2010 | 587 | ± 4.1% | 46% | 38% | 6% | 10% |
| Public Policy Polling (report) | October 29–31, 2010 | 882 | ± 3.3% | 50% | 46% | — | 3% |
| Poll source | Dates administered | Barbara Boxer | Chuck DeVore |
|---|---|---|---|
| Research 2000 | August 9–12, 2009 | 53% | 29% |
| Rasmussen Reports | September 23, 2009 | 46% | 37% |
| The Field Poll | September 18 – October 6, 2009 | 50% | 33% |
| Rasmussen Reports | November 17, 2009 | 46% | 36% |
| Rasmussen Reports | January 14, 2010 | 46% | 40% |
| The Field Poll | January 5–17, 2010 | 51% | 34% |
| PPIC | January 27, 2010 | 47% | 39% |
| Rasmussen Reports | February 11, 2010 | 47% | 42% |
| Research 2000 | March 10, 2010 | 49% | 39% |
| Rasmussen Reports | March 11, 2010 | 46% | 40% |
| Field Research | March 18, 2010 | 45% | 41% |
| PPIC | March 24, 2010 | 46% | 40% |
| Rasmussen Reports | April 12, 2010 | 42% | 39% |
| Rasmussen Reports | May 12, 2010 | 46% | 40% |
| Public Policy Institute of California (Report) | May 2010 | 50% | 39% |
| Research 2000 | May 17–19, 2010 | 47% | 38% |
| Public Policy Polling | May 21–23, 2010 | 46% | 40% |
| USC/Los Angeles Times (Report) | May 19–26, 2010 | 46% | 36% |
| Poll source | Dates administered | Barbara Boxer | Tom Campbell |
|---|---|---|---|
| Rasmussen Reports | January 14, 2010 | 46% | 42% |
| The Field Poll | January 5–17, 2010 | 48% | 38% |
| PPIC | January 27, 2010 | 45% | 41% |
| Rasmussen Reports | February 11, 2010 | 45% | 41% |
| Research 2000 | March 10, 2010 | 47% | 43% |
| Rasmussen Reports | March 11, 2010 | 43% | 41% |
| Field Research | March 18, 2010 | 43% | 44% |
| PPIC | March 24, 2010 | 43% | 44% |
| Rasmussen Reports | April 12, 2010 | 42% | 41% |
| Rasmussen Reports | May 12, 2010 | 42% | 41% |
| Public Policy Institute of California (Report) | May 2010 | 46% | 40% |
| Research 2000 | May 17–19, 2010 | 47% | 40% |
| Public Policy Polling | May 21–23, 2010 | 47% | 40% |
| USC/Los Angeles Times (Report) | May 19–26, 2010 | 38% | 45% |
Fundraising
| Candidate (party) | Receipts | Disbursements | Cash on hand | Debt |
|---|---|---|---|---|
| Barbara Boxer (D) | $20,314,189 | $22,178,746 | $2,271,034 | $0 |
| Carly Fiorina (R) | $17,935,605 | $16,664,055 | $1,271,550 | $805,844 |
| Jerry Carroll (I) | $140 | $140 | $10 | $1,305 |
| Marsha Feinland (P&F) | $0 | $0 | $0 | $0 |
| Neil Goldberg (I) | $0 | $0 | $0 | $0 |
| Gail Lightfoot (L) | $0 | $0 | $0 | $0 |
| Edward Noonan (AI) | $0 | $0 | $0 | $0 |
| Duane Roberts (G) | $0 | $0 | $0 | $12,562 |
| Source: Federal Election Commission (FEC) (Note that some candidates filed with the FEC, but did not pursue their candidacy.) | ||||
Results
Despite the last poll before the election showed Fiorina only trailing by 4 points, on election night Boxer defeated Fiorina by a ten-point margin, and around a one million vote majority. Boxer performed extremely well in Los Angeles County, and the San Francisco Bay Area. Boxer was declared the winner shortly after the polls closed. Fiorina conceded defeat to Boxer at 11:38 P.M.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Democratic | Barbara Boxer (incumbent) | 5,218,137 | 52.18% | −5.53% | |
| Republican | Carly Fiorina | 4,217,386 | 42.17% | +4.37% | |
| Libertarian | Gail Lightfoot | 175,235 | 1.75% | −0.05% | |
| Peace and Freedom | Marsha Feinland | 135,088 | 1.35% | −0.67% | |
| Green | Duane Roberts | 128,512 | 1.29% | N/A | |
| American Independent | Edward Noonan | 125,435 | 1.25% | +0.58% | |
| Write-in | 67 | 0.00% | ±0.00% | ||
| Total votes | 9,999,860 | 100.0% | |||
| Democratic hold | |||||
By county
Results from the Secretary of State of California.
| County | Boxer | Votes | Fiorina | Votes | Noonan | Votes | Roberts | Votes | Lightfoot | Votes | Feinland | Votes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alameda | 73.9% | 338,632 | 22.1% | 100,989 | 0.7% | 3,362 | 1.3% | 5,560 | 1.1% | 5,334 | 0.9% | 4,537 |
| Alpine | 50.9% | 282 | 44.0% | 244 | 0.7% | 4 | 0.7% | 4 | 2.5% | 14 | 1.2% | 7 |
| Amador | 31.9% | 5,137 | 59.6% | 9,617 | 2.3% | 364 | 1.2% | 209 | 3.0% | 480 | 2.0% | 334 |
| Butte | 37.0% | 27,827 | 54.5% | 40,958 | 1.8% | 1,393 | 1.9% | 1,435 | 2.9% | 2,181 | 1.9% | 1,456 |
| Calaveras | 32.1% | 6,294 | 58.6% | 11,495 | 3.0% | 593 | 1.6% | 326 | 3.1% | 617 | 1.6% | 324 |
| Colusa | 30.3% | 1,567 | 63.4% | 3,288 | 1.4% | 76 | 1.2% | 67 | 2.2% | 109 | 1.5% | 81 |
| Contra Costa | 59.8% | 206,270 | 35.9% | 123,934 | 1.0% | 3,492 | 1.0% | 3,607 | 1.4% | 4,996 | 0.9% | 3,181 |
| Del Norte | 39.4% | 3,212 | 52.0% | 4,240 | 2.1% | 177 | 1.8% | 154 | 3.0% | 245 | 1.7% | 139 |
| El Dorado | 32.7% | 25,085 | 61.0% | 46,771 | 1.3% | 1,043 | 1.1% | 910 | 2.4% | 1,822 | 1.5% | 1,129 |
| Fresno | 37.5% | 74,705 | 57.0% | 113,583 | 1.3% | 2,633 | 1.2% | 2,431 | 1.5% | 3,067 | 1.5% | 3,079 |
| Glenn | 25.5% | 2,020 | 66.3% | 5,257 | 2.1% | 174 | 1.6% | 128 | 2.7% | 208 | 1.8% | 143 |
| Humboldt | 54.6% | 27,081 | 37.6% | 18,659 | 0.8% | 420 | 3.2% | 1,574 | 2.5% | 1,284 | 1.3% | 653 |
| Imperial | 55.6% | 14,802 | 37.2% | 9,887 | 1.2% | 341 | 1.9% | 516 | 1.9% | 511 | 2.2% | 570 |
| Inyo | 33.8% | 2,353 | 56.2% | 3,909 | 2.4% | 169 | 1.7% | 120 | 3.5% | 241 | 2.4% | 170 |
| Kern | 30.0% | 51,364 | 62.0% | 106,448 | 1.9% | 3,302 | 1.4% | 2,435 | 2.6% | 4,522 | 2.1% | 3,641 |
| Kings | 30.0% | 7,816 | 62.7% | 16,362 | 2.2% | 560 | 1.1% | 309 | 1.9% | 520 | 2.1% | 542 |
| Lake | 49.0% | 10,265 | 40.8% | 8,534 | 2.8% | 585 | 2.4% | 505 | 3.0% | 625 | 2.0% | 440 |
| Lassen | 24.0% | 2,200 | 66.7% | 6,127 | 1.6% | 155 | 1.7% | 157 | 4.0% | 374 | 2.0% | 185 |
| Los Angeles | 62.3% | 1,432,450 | 32.6% | 749,353 | 1.0% | 23,198 | 1.2% | 29,323 | 1.5% | 33,431 | 1.4% | 32,168 |
| Madera | 30.3% | 10,308 | 62.9% | 21,413 | 1.7% | 601 | 1.3% | 462 | 1.9% | 632 | 1.9% | 630 |
| Marin | 69.3% | 78,236 | 27.5% | 31,001 | 0.6% | 756 | 0.9% | 982 | 1.1% | 1,237 | 0.6% | 710 |
| Mariposa | 31.8% | 2,593 | 60.4% | 4,939 | 1.9% | 158 | 1.7% | 147 | 2.8% | 223 | 1.4% | 118 |
| Mendocino | 61.6% | 19,422 | 29.9% | 9,426 | 2.0% | 643 | 2.8% | 867 | 2.3% | 749 | 1.4% | 472 |
| Merced | 40.2% | 19,058 | 53.4% | 25,280 | 1.7% | 827 | 1.2% | 576 | 1.8% | 854 | 1.7% | 831 |
| Modoc | 20.9% | 787 | 70.6% | 2,666 | 2.2% | 84 | 1.4% | 56 | 3.1% | 116 | 1.8% | 68 |
| Mono | 43.5% | 1,155 | 50.1% | 1,455 | 1.7% | 154 | 1.5% | 81 | 2.1% | 76 | 1.1% | 556 |
| Monterey | 59.1% | 58,574 | 35.0% | 34,721 | 1.1% | 1,182 | 1.3% | 1,315 | 2.0% | 1,914 | 1.5% | 1,497 |
| Napa | 56.2% | 26,194 | 38.1% | 17,743 | 1.4% | 658 | 1.5% | 732 | 1.8% | 836 | 1.0% | 511 |
| Nevada | 40.9% | 18,504 | 52.7% | 23,875 | 0.6% | 310 | 1.8% | 860 | 3.1% | 1,367 | 0.9% | 424 |
| Orange | 37.1% | 323,477 | 57.7% | 502,756 | 1.1% | 10,432 | 1.1% | 10,137 | 1.7% | 14,625 | 1.3% | 10,904 |
| Placer | 33.6% | 47,331 | 60.2% | 84,905 | 1.5% | 2,142 | 1.0% | 1,518 | 2.2% | 3,239 | 1.5% | 2,132 |
| Plumas | 32.1% | 2,934 | 60.3% | 5,521 | 1.7% | 161 | 1.4% | 131 | 2.8% | 257 | 1.7% | 160 |
| Riverside | 40.7% | 195,418 | 53.2% | 255,738 | 1.6% | 8,117 | 1.2% | 6,046 | 1.8% | 8,321 | 1.5% | 7,404 |
| Sacramento | 50.4% | 210,164 | 43.5% | 181,300 | 1.6% | 6,833 | 1.1% | 4,981 | 2.1% | 8,667 | 1.3% | 5,560 |
| San Benito | 49.7% | 7,909 | 43.8% | 6,977 | 1.3% | 215 | 1.1% | 191 | 2.2% | 337 | 1.9% | 307 |
| San Bernardino | 42.7% | 185,164 | 49.9% | 216,441 | 1.8% | 8,111 | 1.4% | 6,302 | 2.4% | 10,424 | 1.8% | 7,926 |
| San Diego | 43.5% | 389,806 | 50.7% | 454,301 | 1.3% | 11,725 | 1.3% | 11,808 | 1.8% | 16,578 | 1.4% | 12,585 |
| San Francisco | 80.0% | 213,252 | 16.2% | 43,108 | 0.6% | 1,630 | 1.5% | 3,863 | 1.0% | 2,780 | 0.7% | 1,937 |
| San Joaquin | 44.5% | 70,031 | 48.5% | 76,342 | 1.6% | 2,608 | 1.3% | 2,122 | 2.1% | 3,358 | 2.0% | 3,175 |
| San Luis Obispo | 42.8% | 44,799 | 51.2% | 53,695 | 1.2% | 1,347 | 1.1% | 1,250 | 2.5% | 2,521 | 1.2% | 1,293 |
| San Mateo | 66.5% | 146,537 | 29.9% | 65,803 | 0.8% | 1,866 | 1.0% | 2,208 | 1.2% | 2,605 | 0.6% | 1,480 |
| Santa Barbara | 49.8% | 64,771 | 45.2% | 58,817 | 1.0% | 1,425 | 1.0% | 1,432 | 1.8% | 2,243 | 1.2% | 1,578 |
| Santa Clara | 63.3% | 320,734 | 32.0% | 161,986 | 1.0% | 5,105 | 1.1% | 5,711 | 1.6% | 8,148 | 1.0% | 5,295 |
| Santa Cruz | 68.6% | 65,049 | 25.4% | 24,065 | 0.9% | 923 | 1.6% | 1,579 | 2.2% | 2,048 | 2.3% | 1,257 |
| Shasta | 26.4% | 17,204 | 66.1% | 43,056 | 2.0% | 1,266 | 1.3% | 902 | 2.6% | 1,683 | 1.6% | 1,060 |
| Sierra | 29.1% | 529 | 62.3% | 1,135 | 2.4% | 45 | 1.4% | 27 | 2.8% | 51 | 2.0% | 37 |
| Siskiyou | 33.7% | 6,132 | 57.2% | 10,430 | 2.2% | 405 | 1.4% | 270 | 3.6% | 648 | 1.9% | 360 |
| Solano | 55.1% | 64,658 | 39.2% | 45,995 | 1.3% | 1,600 | 1.2% | 1,429 | 2.0% | 2,289 | 1.2% | 1,460 |
| Sonoma | 64.3% | 116,996 | 29.5% | 53,678 | 1.4% | 2,686 | 1.5% | 2,806 | 2.1% | 3,720 | 1.2% | 2,281 |
| Stanislaus | 39.6% | 47,158 | 53.6% | 63,814 | 1.6% | 2,007 | 1.5% | 1,789 | 2.0% | 2,455 | 1.7% | 2,029 |
| Sutter | 31.9% | 8,121 | 61.2% | 15,606 | 1.9% | 487 | 1.1% | 292 | 2.4% | 607 | 1.5% | 408 |
| Tehama | 26.6% | 5,352 | 64.3% | 12,950 | 2.6% | 524 | 1.5% | 321 | 3.1% | 622 | 1.9% | 397 |
| Trinity | 37.1% | 2,029 | 51.4% | 2,813 | 2.0% | 112 | 3.5% | 192 | 4.4% | 242 | 1.6% | 90 |
| Tulare | 30.6% | 24,742 | 62.9% | 50,856 | 1.5% | 1,264 | 1.1% | 921 | 1.8% | 1,509 | 2.1% | 1,625 |
| Tuolumne | 33.4% | 7,430 | 58.6% | 13,057 | 2.6% | 576 | 1.6% | 359 | 2.5% | 564 | 1.3% | 304 |
| Ventura | 44.8% | 115,337 | 49.9% | 128,619 | 1.3% | 3,394 | 1.1% | 3,095 | 1.8% | 4,586 | 1.1 | 2,965 |
| Yolo | 59.0% | 34,925 | 35.9% | 21,263 | 1.1% | 683 | 1.2% | 764 | 1.7% | 973 | 1.1% | 677 |
| Yuba | 32.4% | 5,212 | 58.6% | 9,452 | 2.4% | 394 | 1.4% | 231 | 3.3% | 536 | 1.9% | 210 |
- Counties that flipped from Democratic to Republican
- Merced (largest community: Merced)
- Mono (largest municipality: Mammoth Lakes)
- San Luis Obispo (largest town: San Luis Obispo)
- San Bernardino (largest town: San Bernardino)
- San Diego (largest community: San Diego)
- San Joaquin (largest city: Stockton)
- Santa Barbara (largest municipality: Santa Barbara)
By congressional district
Boxer won 33 of 53 congressional districts, with the remaining 20 going to Fiorina, including one that elected a Democrat.
| District | Boxer | Fiorina | Representative |
|---|---|---|---|
| 1st | 57% | 36% | Mike Thompson |
| 2nd | 32% | 60% | Wally Herger |
| 3rd | 41% | 53% | Dan Lungren |
| 4th | 34% | 60% | Tom McClintock |
| 5th | 62% | 31% | Doris Matsui |
| 6th | 67% | 28% | Lynn Woolsey |
| 7th | 65% | 29% | George Miller |
| 8th | 81% | 15% | Nancy Pelosi |
| 9th | 85% | 12% | Barbara Lee |
| 10th | 56% | 39% | John Garamendi |
| 11th | 44% | 51% | Jerry McNerney |
| 12th | 68% | 28% | Jackie Speier |
| 13th | 69% | 26% | Pete Stark |
| 14th | 65% | 30% | Anna Eshoo |
| 15th | 62% | 33% | Mike Honda |
| 16th | 64% | 31% | Zoe Lofgren |
| 17th | 63% | 31% | Sam Farr |
| 18th | 48% | 45% | Dennis Cardoza |
| 19th | 34% | 59% | George Radanovich (111th Congress) |
| Jeff Denham (112th Congress) | |||
| 20th | 48% | 43% | Jim Costa |
| 21st | 30% | 64% | Devin Nunes |
| 22nd | 29% | 64% | Kevin McCarthy |
| 23rd | 56% | 38% | Lois Capps |
| 24th | 40% | 55% | Elton Gallegly |
| 25th | 39% | 54% | Buck McKeon |
| 26th | 42% | 53% | David Dreier |
| 27th | 58% | 37% | Brad Sherman |
| 28th | 70% | 25% | Howard Berman |
| 29th | 61% | 35% | Adam Schiff |
| 30th | 63% | 34% | Henry Waxman |
| 31st | 78% | 16% | Xavier Becerra |
| 32nd | 64% | 30% | Judy Chu |
| 33rd | 83% | 13% | Diane Watson (111th Congress) |
| Karen Bass (112th Congress) | |||
| 34th | 71% | 23% | Lucille Roybal-Allard |
| 35th | 79% | 16% | Maxine Waters |
| 36th | 56% | 39% | Jane Harman |
| 37th | 74% | 21% | Laura Richardson |
| 38th | 67% | 26% | Grace Napolitano |
| 39th | 60% | 34% | Linda Sánchez |
| 40th | 37% | 57% | Ed Royce |
| 41st | 35% | 57% | Jerry Lewis |
| 42nd | 34% | 61% | Gary Miller |
| 43rd | 60% | 32% | Joe Baca |
| 44th | 39% | 55% | Ken Calvert |
| 45th | 42% | 52% | Mary Bono |
| 46th | 38% | 56% | Dana Rohrabacher |
| 47th | 56% | 37% | Loretta Sanchez |
| 48th | 36% | 59% | John B. T. Campbell III |
| 49th | 34% | 59% | Darrell Issa |
| 50th | 40% | 55% | Brian Bilbray |
| 51st | 56% | 37% | Bob Filner |
| 52nd | 35% | 59% | Duncan L. Hunter |
| 53rd | 58% | 36% | Susan Davis |
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