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U.S. Senate · South Dakota · Nov 3 · 7 days out
South Dakota Senate
Mike Rounds (Republican, incumbent) against Brian Bengs (Independent).
Where they stand · 45 points apart
Bengs is an estimateSolid is a voting record; hollow is read from the campaign’s own words. Biggest gaps first.
Mike RoundsrecordBrian Bengsestimate
Money
FEC to Sep 30RaisedRounds$3.7MBengs$1.7MItemized, named donorsRounds$1.5MBengs$819kNamed donorsRounds730Bengs1,207Itemized from South DakotaRounds10%Bengs24%
The FEC doesn't name donors who give under $200, so their gifts count in Raised but not Itemized.
All market contracts · Kalshi and Polymarket · 4
| Candidate | Platform | Contract | Bid | Ask | Last | Volume | |
|---|---|---|---|---|---|---|---|
| Mike Rounds | Kalshi | Republican wins | 95% | 95% | 95% | $142,299 | Open ↗ |
| Mike Rounds | Polymarket | Republican wins | 95% | 96% | 96% | $39,823 | Open ↗ |
| Brian Bengs | Kalshi | this candidate | 5% | 6% | 5% | $286,011 | Open ↗ |
| Brian Bengs | Polymarket | this candidate | 5% | 5% | 5% | $15,847 | Open ↗ |
Prices in cents on the dollar, read Oct 27, 2026. A party contract pays if that party wins the seat.
Also on the South Dakota ballot
Statement estimate · odds are a market close, not a poll