SD Senate
South Dakota Senate winner? (2026)
40k contracts traded · 29k open
SD SENATE 2026Live · updated hourlyRating: Safe R
South Dakota Senate Race 2026 — Live Prediction Market Odds
South Dakota is a safe Republican hold with Mike Rounds running for re-election. The market gives it little attention; the state is reliably red at the federal level, and the contract is a calibration point on the board — what a settled Republican hold looks like — more than a trade.
Seat held by Mike Rounds (R)running
Quick Answer
As of August 28, 2026, Mike Rounds leads the South Dakota Senate market at 95¢ — real money putting the implied probability at 95%. Forecasters rate the seat Safe R, so the gap between that rating and this price is the whole question.
Seat held by Mike Rounds (R) — incumbent.
Why trust the price: prediction markets called all seven 2024 presidential swing states correctly, often while polling averages were still split. Our state-by-state audit grades where they missed too.
Who holds the South Dakota seat
Mike Rounds
RepublicanIncumbent
Holds the seat and is on the 2026 ballot — read the live board below for the current market favorite.
Live South Dakota Senate Market
Kalshi · CFTC-regulated · real moneyTrade →
How to read this
Each contract pays $1 at resolution, so the price in cents is the market’s implied probability — a 58¢ contract is a 58% chance. When the leading price sits near 50¢, the market is telling you the race is a genuine coin flip.
South Dakota Senate 2026 — frequently asked
Who is favored to win the South Dakota Senate race in 2026?
The live board above shows the current market favorite — read each contract’s price as the market’s implied probability, so a 55¢ contract is a 55% chance. Going into the cycle the seat is held by Mike Rounds (Republican) and rated safe r; because a real-money market reprices continuously, take today’s favorite off the price, not a static rating.
How do I trade the South Dakota Senate market on Kalshi?
Kalshi lists the South Dakota Senate winner as a set of YES/NO contracts, one per outcome, each settling at $1 if it happens and $0 if it doesn’t. Buy the side you think is underpriced relative to your own probability, and the difference between your estimate and the market price is your edge. Kalshi is CFTC-regulated and open to traders in all 50 states; every price on this page links straight to the live market.
How accurate were prediction markets in South Dakota in 2024?
Prediction markets had a strong 2024 — Kalshi and Polymarket called all seven swing states correctly the night before, often while the polling averages were still split. Our full state-by-state scorecard, including where the markets missed, is in the 2024 accuracy audit linked below, and it’s the best base rate for how much to trust the South Dakota contract this cycle.
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