$45.16K
2
4
$45.16K
2
4
Trader mode: Actionable analysis for identifying opportunities and edge
In 2026 If a representative X party is sworn in as a Senator of Idaho for the term beginning in 2027, then the market resolves to Yes. Early close condition: This market will close early following the swearing in of the Senator for the seat in question. This market will close early following the swearing in of the Senator for the seat in question.
Prediction markets currently give Republicans a roughly 19 in 20 chance of winning Idaho’s 2026 U.S. Senate race. This is an extremely high level of confidence. In simple terms, traders collectively see a Democratic victory as very unlikely, akin to expecting a major upset in a sports championship.
The forecast is based on Idaho’s consistent political history and current landscape. The state has not elected a Democrat to the Senate since Frank Church in 1974. In recent statewide elections, Republican candidates typically win by margins of 20 to 30 percentage points.
The seat in question is currently held by Senator Mike Crapo, a Republican who has held it since 1999. While he has not officially announced his 2026 plans, he remains popular. Even if he were to retire, the state’s strong Republican voter registration advantage makes any open seat a likely hold for the party. There is no prominent Democratic candidate on the horizon who is considered a serious threat in this environment.
The main event is the candidate filing deadline in early 2026. Watch for Senator Crapo’s official decision on seeking re-election, expected in 2025. A surprise retirement could briefly lower Republican odds if a contentious primary emerges, but the effect would likely be small. The primary election itself, likely in May 2026, will finalize the candidates. Barring an extraordinary scandal or national political earthquake, the general election in November 2026 is expected to confirm the market’s prediction.
For elections in politically stable states like Idaho, prediction markets have a strong track record. They reliably capture the near-certainty of outcomes in heavily partisan seats. The main limitation here is time. The election is over two years away, and a lot can theoretically happen. However, the market’s 95% probability shows traders believe Idaho’s political fundamentals are so strong that major change is very improbable. These odds are more a reflection of the state’s political identity than a forecast of a specific race.
Prediction markets assign a 95% probability that a Republican will win Idaho's 2026 U.S. Senate race. This price, consistent across both Polymarket and Kalshi, indicates near-certainty. A 95% chance means the market views a Democratic victory as a remote, low-probability event. The combined trading volume of $45,000 is relatively thin for a national election two years away, reflecting the perceived lack of competitive uncertainty.
Idaho's partisan alignment is the primary driver. The state has not elected a Democrat to the Senate since Frank Church in 1974. In the 2022 Senate race, Republican Mike Crapo won with over 60% of the vote. Current Senator Jim Risch, whose seat is up in 2026, won his 2020 race by more than 30 percentage points. The state's political fundamentals make any Republican nominee the overwhelming favorite from the start of the campaign. The 95% price essentially accounts for the baseline partisan lean, pricing in only a small chance for an extraordinary political shock or scandal.
The odds could shift from their current ceiling if a significant, unforeseen event alters the race's dynamics. A serious health issue or a major scandal involving the likely Republican nominee could introduce uncertainty. A national political realignment or a uniquely strong Democratic candidate with substantial independent appeal might also narrow the gap, but such scenarios are historically rare in Idaho. The market will likely remain stable until the candidate field is set in early 2026. Any movement before then would signal a major disruption in the state's political environment.
The 95% probability is synchronized between Polymarket and Kalshi, showing no arbitrage opportunity. The alignment confirms a strong consensus on the outcome. The thin liquidity across both platforms is typical for a long-dated race considered non-competitive. This low volume means large trades could move the price more easily than in a heavily traded market, but any significant deviation from 95% would likely be quickly corrected by traders betting on the overwhelming historical precedent.
AI-generated analysis based on market data. Not financial advice.
This prediction market topic concerns the outcome of the 2026 United States Senate election in Idaho. It asks whether a specific political party, designated as 'X' in the market description, will win the seat and have its candidate sworn in as a U.S. Senator for the term beginning in January 2027. The market will resolve to 'Yes' if a senator from that party is sworn in. The seat in question is currently held by Republican Senator Mike Crapo, whose third term expires on January 3, 2027. Idaho is considered one of the most reliably Republican states in national politics, having last elected a Democrat to the Senate in 1974. The 2026 race will be a key test of whether this dominance continues or if shifting national dynamics or a unique candidate can alter the state's political landscape. Interest in this market stems from its function as a barometer for national party strength in a deep-red state, potential implications for Senate control in the 118th Congress, and the specific political fortunes of the individuals who choose to run.
Idaho's modern political alignment as a Republican stronghold was cemented in the latter half of the 20th century. The state last elected a Democrat to the U.S. Senate in 1974, when Frank Church won his final term. Since then, Republicans have held both Senate seats continuously. Mike Crapo was first elected in 1998, succeeding Republican Dirk Kempthorne, and has won re-election by wide margins. His smallest victory was in 2004, when he received 69.1% of the vote. The Democratic Party's performance has been consistently weak in federal races; in the 2020 Senate election, incumbent Republican Jim Risch defeated Democrat Paulette Jordan by a margin of 62.6% to 33.1%. This historical dominance means any serious challenge from a Democrat would require a significant departure from decades of voting patterns, likely contingent on a major political realignment, a uniquely flawed Republican candidate, or an exceptionally strong Democratic campaign. The Republican primary has historically been the decisive contest for this seat.
The outcome of Idaho's 2026 Senate election matters for the balance of power in the U.S. Senate. While a Republican victory is expected, a surprise Democratic win could directly shift the Senate's partisan composition, affecting legislative agendas on issues like taxation, judicial appointments, and federal spending. For Idaho, the election determines whether the state continues to be represented by seniority and institutional knowledge, if Crapo runs again, or by a new senator who may have less immediate influence in Washington. The race also serves as a national indicator. A closer-than-expected margin could signal changing demographics or voter dissatisfaction in traditionally safe Republican states, influencing party strategy and resource allocation nationwide. Conversely, a dominant Republican win would reinforce the status quo and could discourage future Democratic investment in the state. The campaign itself will highlight policy debates on federal land management, agriculture, and energy policy, which are particularly salient in Idaho.
As of early 2025, Senator Mike Crapo has not announced his plans for the 2026 election. Political observers in Idaho are awaiting his decision, expected sometime in 2025, which will dictate the race's dynamics. If he runs for re-election, he would be the overwhelming favorite in both the primary and general election. If he retires, an open primary is anticipated, with potential candidates like Lieutenant Governor Scott Bedke and Attorney General Raúl Labrador assessing their chances. The Idaho Democratic Party has not publicly identified a likely candidate. The state Republican Party's 2024 decision to close its primary to registered Republicans only is now official, meaning unaffiliated voters cannot participate in the GOP primary, potentially pushing candidates to appeal to the party's base.
The seat up for election in 2026 is currently held by Republican Senator Mike Crapo. He was first elected in 1998 and is serving his third six-year term, which ends on January 3, 2027.
The general election will be held on Tuesday, November 3, 2026. The primary election, where parties select their nominees, is typically held in May of that year. The winner will be sworn in in January 2027.
No. The last Democrat elected to the U.S. Senate from Idaho was Frank Church in 1974. Every Senate election in Idaho since 1980 has been won by a Republican candidate.
A closed primary allows only voters registered with a party to vote in that party's primary. The Idaho Republican Party adopted this rule for 2024 onward. For the 2026 Senate race, it means only registered Republicans can vote in the GOP primary, which could favor candidates aligned with the party's most conservative voters.
If Senator Crapo retires, the race becomes an open seat contest. This would likely trigger a competitive Republican primary among figures like Lieutenant Governor Scott Bedke and Attorney General Raúl Labrador. A Democratic candidate would still face a steep uphill battle in the general election.
Educational content is AI-generated and sourced from Wikipedia. It should not be considered financial advice.
2 markets tracked
No data available
| Market | Polymarket | Kalshi | Diff |
|---|---|---|---|
| 93% | 95% | 2% |
 | 8% | 5% | 3% |
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In 2026 If a representative X party is sworn in as a Senator of Idaho for the term beginning in 2027, then the market resolves to Yes. Early close condition: This market will close early following the swearing in of the Senator for the seat in question. This market will close early following the swearing in of the Senator for the seat in question.
This market will resolve according to the winner of the 2026 midterm Idaho 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 aff
This market will resolve according to the winner of the 2026 midterm Idaho 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 no
If a representative of the Republican party is sworn in as a Senator of Idaho for the term beginning in 2027, then the market resolves to Yes. Early close condition: This market will close early following the swearing in of the Senator for the seat in question.
This market will resolve according to the winner of the 2026 midterm Idaho 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 no
If a representative of the Democratic party is sworn in as a Senator of Idaho for the term beginning in 2027, then the market resolves to Yes. Early close condition: This market will close early following the swearing in of the Senator for the seat in question.
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