Idaho Senate Race: Who Will Win in 2028
Idaho’s Senate seat is up for election in 2028, with the state’s deep Republican lean shaping expectations well before candidates formally emerge. Idaho has not sent a Democrat to the U.S. Senate since the 1970s, making the general election contest largely a formality once the GOP nominee is set. Speculation over potential candidates, including possible incumbents or statewide officials, is already circulating.
Why Markets Are Watching
Senate control in Washington often hinges on a handful of competitive seats, but Idaho’s race matters differently: it’s a bellwether for Republican Party dynamics rather than a swing contest. Primary fights, potential retirements, and intraparty factionalism could reshape who represents the state and signal broader trends within the GOP heading into the next decade.
How Prediction Markets Frame the Race
With the general election outcome largely presumed, the real question markets isolate is which individual candidate emerges from a crowded Republican field. Contracts effectively function as a proxy for the party’s internal contest, tracking name recognition, potential endorsements, and shifting political ambitions years before ballots are cast. That makes this less a partisan bet and more a read on Idaho GOP succession.
Related terms
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Democratic Party (United States) -
Republican Party (United States) -
United States Senate -
United States Congress -
General election -
Electoral district -
United States midterm election -
Democrat Party (epithet) -
Idaho -
Partisan (politics) -
2022 United States Senate elections -
2028 United States Senate elections -
Idaho Senate
Total Volume
$1.6m
Kalshi $3.2k · Polymarket $1.6m
Leading Market
Jim Risch
Kalshi 91% · Polymarket 96%
Jim Risch Volume
$719.2k
Kalshi $3.2k · Polymarket $716k
Jim Risch 24h Change
+1.00%
Kalshi 0.00% · 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 |
|---|---|---|---|---|---|---|
| Jim RischRepublican Party | 90.5¢ | 7.0% | , trade Jim Risch on Kalshi (opens in a new tab) | 96.0¢ | 5% | , trade Jim Risch on Polymarket (opens in a new tab) |
| Democratic Party | 14.0¢ | 7.0% | , trade Democratic Party on Kalshi (opens in a new tab) | — | — | — |
| Todd Achilles | — | — | — | 6.0¢ | 5% | , trade Todd Achilles 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) |
|---|---|---|---|
| Jim RischRepublican Party | $719,158.45 | ||
| Democratic Party | $79.00 | No market | |
| Todd Achilles | $923,983.96 | No market |