South Dakota At-Large House Seat: 2026 Winner
South Dakota’s lone at-large U.S. House seat is up for election on November 3, 2026. The seat represents the entire state, making it one of the few House races decided by a full statewide electorate rather than a single district. South Dakota has reliably sent Republicans to this seat in recent cycles, but every midterm brings fresh questions about turnout and candidate strength.
Why Markets Are Watching
Control of the U.S. House could hinge on a handful of seats nationwide, and every race adds to the overall count. South Dakota’s statewide House contest also serves as a gauge of rural and small-state political sentiment heading into the midterms. A competitive showing here would signal broader shifts in voter mood beyond the state’s borders.
How Prediction Markets Frame the Race
The contract reduces a statewide campaign to a single binary question: which party’s nominee wins South Dakota’s at-large seat. That framing isolates partisan outcome from the noise of candidate-specific news, letting traders focus purely on who ultimately prevails. It effectively distills a full election cycle into one resolvable proposition tied to a fixed date.
Related terms
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Democratic Party (United States) -
Republican Party (United States) -
United States House of Representatives -
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Marty Jackley
Total Volume
$35.8k
Kalshi $6.2k · Polymarket $29.6k
Leading Market
Marty Jackley
Kalshi 96% · Polymarket 97%
Marty Jackley Volume
$25.5k
Kalshi $2.3k · Polymarket $23.3k
Marty Jackley 24h Change
-1.00%
Kalshi +0.20% · Polymarket -1.00%
Calculate Your Potential Return
- Kalshi(opens in a new tab) 7.0% fee
- Polymarket(opens in a new tab) 5.0% fee
| Market | Kalshi Yes | Kalshi Fee | Kalshi Payout | Polymarket Yes | Polymarket Fee | Polymarket Payout |
|---|---|---|---|---|---|---|
| Marty JackleyRepublican Party | 96.7¢ | 7.0% | , trade Marty Jackley on Kalshi (opens in a new tab) | 97.0¢ | 5% | , trade Marty Jackley on Polymarket (opens in a new tab) |
| Nicole GoslingDemocratic Party | 3.9¢ | 7.0% | , trade Nicole Gosling on Kalshi (opens in a new tab) | 4.0¢ | 5% | , trade Nicole Gosling on Polymarket (opens in a new tab) |
* Estimates if candidate wins. Actual returns may vary.
All Markets
| Market | Total Volume | Kalshi(opens in a new tab) | Polymarket(opens in a new tab) |
|---|---|---|---|
| Marty JackleyRepublican Party | $25,523.29 | ||
| Nicole GoslingDemocratic Party | $10,274.96 |