Will the Republicans win the South Dakota Senate race in 2026?

The market is pricing Republicans as overwhelming favorites at 93¢, reflecting South Dakota's deep red lean, though the extreme 2440.9% implied yield on the No side signals severe mispricing or illiquidity on the Democratic outcome. With $207,958 in 24-hour volume against $19.2 million open interest and a modest 3¢ spread, the market shows reasonable depth despite the lopsided probability, though the 13 Cliff Risk Index suggests potential volatility near resolution. The flat 7-day price action (92¢ to 93¢) and neutral regime indicate the market has settled on this consensus view with limited new information driving recent movement.

Resolution rules

This market will resolve according to the winner of the 2026 midterm South Dakota U.S. Senate election, inclusive of any run-offs. A candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date. Candidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party. The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.

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