South Dakota Senate race 2026
Our 21-day average puts Mike Rounds at 52.2%, Brian Bengs at 39.2%, Julian Beaudion at 18%, Justin McNeal at 18%, based on 15 polls ending between 7/31/2025 and 10/20/2026. Dots on the chart are individual polls; the line is the rolling average. How to read these numbers.
South Dakota Senate race 2026 over time
15 polls · 21-day rolling average · dots are individual polls
Mike Rounds 52.2%
Brian Bengs 39.2%
Julian Beaudion 18%
Justin McNeal 18%
View data as table
| Choice | Latest average | Polls | Latest poll |
|---|---|---|---|
| Mike Rounds | 52.2% | 15 | 10/20/2026 |
| Brian Bengs | 39.2% | 13 | 10/20/2026 |
| Julian Beaudion | 18% | 2 | 5/30/2026 |
| Justin McNeal | 18% | 1 | 4/11/2026 |
Average result
Unweighted mean across 15 matching polls
View data as table
| Choice | % |
|---|---|
| Mike Rounds | 49.5% |
| Brian Bengs | 38.1% |
| Julian Beaudion | 25% |
| Justin McNeal | 18% |
Individual polls (15)
| End date | Pollster | Sample | Results |
|---|---|---|---|
| 10/20/2026 |
Emerson College
for KELO-TV |
803 LV |
Mike Rounds (R)
Brian Bengs (I)
|
| 10/19/2026 | Quantus Insights | 657 LV |
Mike Rounds (R)
Brian Bengs (I)
|
| 10/16/2026 | Public Opinion Strategies | 500 LV |
Mike Rounds (R)
Brian Bengs (I)
|
| 10/14/2026 |
Mason-Dixon
for South Dakota News Watch, Chiesman Center for Democracy at the University of South Dakota |
500 LV |
Mike Rounds (R)
Brian Bengs (I)
|
| 10/8/2026 |
Concord Public Opinion Partners
for Education Reform Now Advocacy |
400 LV |
Brian Bengs (I)
Mike Rounds (R)
|
| 9/27/2026 | Zenith Research | 500 LV |
Mike Rounds (R)
Brian Bengs (I)
|
| 9/9/2026 | Public Policy Polling | 629 RV |
Mike Rounds (R)
Brian Bengs (I)
|
| 8/30/2026 | Lake Research Partners | 500 LV |
Brian Bengs (I)
Mike Rounds (R)
|
| 8/17/2026 | Impact Research | 500 LV |
Mike Rounds (R)
Brian Bengs (I)
|
| 7/9/2026 |
Public Opinion Strategies
for National Republican Senatorial Committee |
500 LV |
Mike Rounds (R)
Brian Bengs (I)
|
| 5/30/2026 | Public Policy Polling | 726 RV |
Mike Rounds (R)
Brian Bengs (I)
Julian Beaudion (D)
|
| 4/11/2026 |
Mason-Dixon Polling & Research, Inc.
for Chiesman Center for Democracy at the University of South Dakota | South Dakota News Watch |
500 RV |
Mike Rounds (R)
Justin McNeal (R)
|
| 2/18/2026 | Public Policy Polling | 685 RV |
Mike Rounds (R)
Julian Beaudion (D)
|
| 11/14/2025 | Public Policy Polling | 814 RV |
Mike Rounds (R)
Brian Bengs (I)
|
| 7/31/2025 | Public Policy Polling | 552 RV |
Mike Rounds (R)
Brian Bengs (I)
|