South Dakota Senate Race 2026
Latest sourced poll, full poll history, Cook and DDHQ ratings, and candidates. Research snapshot checked 2026-10-22.
Latest poll
Brian Bengs (Independent)43%
Mike Rounds (Republican)42%
Concord Public Opinion Partners (D), fielded 2026-10-06 to 2026-10-08
Cook rating 2026-10-20 · DDHQ forecast 2026-10-22. Win chance, not vote share.
n=400 / Unknown. Poliwave
Lead of 1 pts for Brian Bengs in a single poll. Not a win probability.
Ratings and forecast
- Cook rating
- Solid R
- DDHQ rating
- Safe R
- DDHQ Dem win chance
- 3%
- Currently held by
- R
Candidates
- Brian BengsIndependent
- Mike RoundsRepublican
Seat / incumbent: Rounds
Poll history (8)
| Pollster | Field dates | Results | Sample / method | Source |
|---|---|---|---|---|
| Concord Public Opinion Partners (D) | 2026-10-06 to 2026-10-08 | Brian Bengs (Independent) 43%Mike Rounds (Republican) 42% | n=400 / Unknown | Poliwave Original release |
| Zenith Research | 2026-09-24 to 2026-09-27 | Mike Rounds (Republican) 53%Brian Bengs (Independent) 47% | n=500 / Unknown | Poliwave Original release |
| Public Policy Polling (D) | 2026-09-08 to 2026-09-09 | Mike Rounds (Republican) 45%Brian Bengs (Independent) 42% | n=629 / Unknown | Poliwave Original release |
| Lake Research Partners (D) | 2026-08-26 to 2026-08-30 | Brian Bengs (Independent) 51%Mike Rounds (Republican) 44% | n=500 / Unknown | Poliwave Original release |
| Impact Research (D) | 2026-08-13 to 2026-08-17 | Mike Rounds (Republican) 44%Brian Bengs (Independent) 44% | n=500 / Unknown | Poliwave Original release |
| Public Opinion Strategies (R) | 2026-07-06 to 2026-07-09 | Mike Rounds (Republican) 56%Brian Bengs (Independent) 33% | n=500 / Public Opinion Strategies memo (Aug 5, 2026); live-interviewer statewide survey of likely November 2026 voters. Undecided not printed. | Poliwave Original release |
| Public Policy Polling | 2026-05-29 to 2026-05-30 | Mike Rounds (Republican) 44%Brian Bengs (Independent) 40% | n=726 / Public Policy Polling for independent Brian Bengs, reported by National Journal Hotline. Head-to-head stored (Democratic nominee Julian Beaudion withdrew Aug 4, 2026); three-way was Rounds 43, Bengs 23, Beaudion 18, undecided 16. | Poliwave Original release |
| Public Policy Polling | 2026-02-17 to 2026-02-18 | Mike Rounds (Republican) 47%Brian Bengs (Independent) 35% | n=685 / Public Policy Polling for independent Brian Bengs, reported by National Journal Hotline. Head-to-head with Bengs stored. | Poliwave Original release |
Polls via secondary aggregators, not independently audited. Not a live feed.
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