The 2026 United States Senate election in South Dakota will be held on November 3, 2026, to elect a member of the United States Senate to represent the state of South Dakota. Primary elections will be held on June 2, 2026, with a runoff election held on July 28 if no candidate receives at least 35% of the vote in their respective primaries. Two-term Republican Mike Rounds was re-elected in 2020 with 65.8% of the vote and has not stated whether he will run for re-election.
November 3, 2026 | |||||||
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Republican primary
Candidates
Declared
- Justin McNeal, Navy veteran and businessman
Filed paperwork
- Mike Rounds, incumbent U.S. senator (2015–present) (decision expected in January 2026)
Endorsements
- Executive branch officials
- Donald Trump, president of the United States (2017–2021, 2025–present)
Fundraising
| Campaign finance reports as of September 30, 2025 | |||
|---|---|---|---|
| Candidate | Raised | Spent | Cash on hand |
| Mike Rounds (R) | $2,792,218 | $1,656,323 | $2,818,417 |
| Source: Federal Election Commission | |||
Polling
Mike Rounds vs. Kristi Noem
| Poll source | Date(s) administered | Sample size | Margin of error | Mike Rounds | Kristi Noem | Undecided |
|---|---|---|---|---|---|---|
| Kaplan Strategies | June 2023 | 500 (RV) | – | 26% | 53% | 21% |
Kristin Noem vs. Dusty Johnson
| Poll source | Date(s) administered | Sample size | Margin of error | Kristi Noem | Dusty Johnson | Undecided |
|---|---|---|---|---|---|---|
| Kaplan Strategies | June 2023 | 500 (RV) | – | 54% | 23% | 23% |
Democratic primary
Candidates
Declared
- Julian Beaudion, former South Dakota state trooper, activist, and businessman
Fundraising
| Campaign finance reports as of September 30, 2025 | |||
|---|---|---|---|
| Candidate | Raised | Spent | Cash on hand |
| Julian Beaudion (D) | $146,311 | $114,730 | $31,081 |
| Source: Federal Election Commission | |||
Independents
Candidates
Declared
- Brian Bengs, U.S. Navy and Air Force veteran, former Northern State University political science professor, and Democratic nominee for U.S. Senate in 2022
Fundraising
| Campaign finance reports as of September 30, 2025 | |||
|---|---|---|---|
| Candidate | Raised | Spent | Cash on hand |
| Brain Bengs (I) | $154,886 | $125,175 | $29,710 |
| Source: Federal Election Commission | |||
General election
Predictions
| Source | Ranking | As of |
|---|---|---|
| Inside Elections | Solid R | August 12, 2025 |
| The Cook Political Report | Solid R | October 14, 2025 |
| Sabato's Crystal Ball | Safe R | August 12, 2025 |
| Race To The WH | Safe R | September 4, 2025 |
Polling
Mike Rounds vs. Julian Beaudion
| Poll source | Date(s) administered | Sample size | Margin of error | Mike Rounds (R) | Julian Beaudion (D) | Undecided |
|---|---|---|---|---|---|---|
| Public Policy Polling (D) | November 13–14, 2025 | 814 (RV) | ± 3.3% | 52% | 30% | 18% |
Mike Rounds vs. Brian Bengs
| Poll source | Date(s) administered | Sample size | Margin of error | Mike Rounds (R) | Brian Bengs (I) | Undecided |
|---|---|---|---|---|---|---|
| Public Policy Polling (D) | November 13–14, 2025 | 814 (RV) | ± 3.3% | 44% | 31% | 25% |
| Public Policy Polling (D) | July 30–31, 2025 | 524 (LV) | ± 4.1% | 41% | 28% | 31% |
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