Idaho Senate Race 2026: Who Will Win
Idaho’s 2026 Senate race centers on Republican Jim Risch’s seat, which he has held since 2009 in a state that has not elected a Democrat to the Senate in decades. Candidates will compete in primaries before the general election, with the winner serving a six-year term representing Idaho in Washington. The race unfolds against a backdrop of solidly conservative statewide politics.
Why Markets Are Watching
Idaho’s deep Republican lean makes a general-election upset unlikely, so the more consequential drama may play out in the GOP primary itself. Any credible primary challenge or retirement announcement could reshape the field and signal broader currents within the state’s conservative base. The outcome also factors into the national balance of power in the Senate.
How Prediction Markets Frame the Race
The core question traders face is less about which party wins and more about which individual claims the nomination and seat. Contracts isolate specific named candidates, letting participants express views on primary strength, name recognition, and intra-party positioning rather than simple partisan control. This structure turns a low-suspense general election into a more granular bet on personnel and momentum within Idaho’s Republican coalition.
Related terms
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Democratic Party (United States) -
Republican Party (United States) -
United States Senate -
United States Congress -
General election -
Primary election -
Democrat Party (epithet) -
Rural area -
Idaho -
2024 United States Senate elections -
Jim Risch -
Idaho Democratic Party -
Idaho Republican Party -
David Roth (politician)
Total Volume
$2.7m
Kalshi $1.1m · Polymarket $1.6m
Leading Market
Jim Risch
Kalshi 96% · Polymarket 96%
Jim Risch Volume
$1.3m
Kalshi $547k · Polymarket $716k
Jim Risch 24h Change
+1.00%
Kalshi -0.30% · 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 | 95.6¢ | 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) |
| Todd AchillesIndependent | 6.0¢ | 7.0% | , trade Todd Achilles on Kalshi (opens in a new tab) | 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 | $1,263,032.45 | ||
| Todd AchillesIndependent | $1,404,283.76 | ||
| David RothDemocratic Party | $77,362.70 | No market |