South Dakota Senate polling average
South Dakota Senate: Monolith Average
Brian Bengs (I) · Mike Rounds (R)
Monolith Average · nonpartisan polls
R+15.2
Brian Bengs (I) 38.7% · Mike Rounds (R) 53.9%
3 pollsters
3 pollsters
Monolith Average (All Polls)
R+10.2
Brian Bengs (I) 39.9% · Mike Rounds (R) 50.1%
4 pollsters
4 pollsters
The two averages differ by 5.0 points. The All Polls number includes partisan or unknown-sponsor polls; see the table for which polls each number uses.
Updated 2026-10-30 14:41 CT. Margin = first-listed candidate minus second; undecided voters are not allocated. Polls from the last 30 days; each pollster counts once (its latest poll); weights favor larger, newer polls. How we calculate this.
Monolith Average: daily margin since Oct. 1
Above the dashed line = first-listed candidate leads (positive margin); gaps = fewer than 2 pollsters that day.
Monolith Average (All Polls): daily margin since Oct. 1
Above the dashed line = first-listed candidate leads (positive margin); gaps = fewer than 2 pollsters that day.
Polls
| Pollster | Dates | Sample | Bengs | Rounds | Other | Sponsor type | Used in | Source | Notes |
|---|---|---|---|---|---|---|---|---|---|
| Concord Public Opinion Partners for Democrats for Education Reform | 2026-10-22 to 2026-10-26 | 448 LV | 43.0 | 41.0 | Partisan (D) | All Polls only | source | Approved: automatic: both figures found next to the names in the release text | |
| Emerson College for KELO-TV | 2026-10-19 to 2026-10-20 | 803 LV | 42.0 | 50.0 | Nonpartisan | Both | source | Approved: automatic: both figures found next to the names in the release text | |
| Quantus Insights | 2026-10-17 to 2026-10-19 | 657 LV | 36.0 | 57.0 | Nonpartisan | Both | source | Figures corrected to the cited release (Semafor, 10/21: Rounds 57%, Bengs 36%); lead source had 59/37 | Approved: hand: corrected to cited release (Semafor) 57/36 | |
| Mason-Dixon for South Dakota News Watch; Chiesman Center for Democracy at the University of South Dakota | 2026-10-12 to 2026-10-14 | 500 LV | 37.0 | 56.0 | Nonpartisan | Both | source | Approved: automatic: both figures found next to the names in the release text |
Spot an error? Email [email protected]. Downloadable data files are coming soon.