Primary
Primary held June 2, 2026.
Republican Primary
| Candidate | Votes | % | |
|---|---|---|---|
| Mike Rounds ✓ | 101,471 | 75.8% | |
| Justin McNeal | 32,412 | 24.2% |
Runoff: Tuesday, July 28, 2026 in 8 days
Full calendar and every race: South Dakota primary guide
Race Overview
General Election Polling Trend
PollingSource average — trailing average of all polls from the last 90 days.
Candidates
Mike Rounds Nominee Incumbent
RepublicanGeneral Election Polling Average
Average reflects all polls from the last 90 days; table shows the most recent 30 days or the newest 3 polls, whichever is more — subscribe for the full history. How accurate is each pollster? →
| Pollster | Date | Sample | MoE | Dem | Rep |
|---|---|---|---|---|---|
| Public Policy Polling (I) partisan·D ±2.0 | 2026-05-30 | 726 RV | ±3.60 | Julian Beaudion 18.00% | Mike Rounds 43.00% |
Questions About This Race
Who is winning the 2026 South Dakota Senate race?
Mike Rounds leads Julian Beaudion 43% to 18% in the PollingSource polling average — a R+25.0 margin based on 1 poll from the last 90 days.
Is the 2026 South Dakota Senate race competitive?
No — the PollingSource polling average rates it Safe R for Republicans.
What does the latest poll of the 2026 South Dakota Senate race say?
The most recent public poll, from Public Policy Polling (I) (completed May 30, 2026), found Julian Beaudion (D) at 18% and Mike Rounds (R) at 43%.
When is the 2026 South Dakota Senate race decided?
Election Day is Tuesday, November 3, 2026.
How is the PollingSource average calculated?
The PollingSource average is the unweighted mean of every scientific public poll of the race from the last 90 days — we do not exclude pollsters. Each race page lists the individual polls behind the average with pollster, field dates, sample size, and margin of error. Full details: pollingsource.com/methodology.
Race Notes
Two-term incumbent
Independent Expenditures Updated 6 hours ago
Top Spenders
- DEFEND AMERICAN JOBS $423,164
- SOUTH DAKOTA CONSERVATIVE PAC $175,200
Full outside-spending research — every committee, every race →