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Updated Oct 16, 2026, 1:45 PM ET
House · 3 November 2026
ID-01 House 2026
- Polymarket
- 95.8%
- Kalshi
- 98.0%
- Spread
- 2.2 pts
- 24h
- –
- 7 days
- −0.3
- Updated
- Oct 16, 2026, 1:45 PM ET
Latest coverage
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No story this week names this candidate.
Russ Fulcher, last 60 days
How to read this chart
The green line is the TruthIndex™, the chance of this outcome. It combines the prices on both venues and gives more weight to the venue with more money in its order book. The two thinner lines are Polymarket's and Kalshi's own prices, and the grey band between them shows how far apart the two venues are.
The pale bands behind the lines are the rating zones (Toss-up, Lean, Likely and Safe), so you can see when the race moved from one rating to another. Move along the chart, or use the arrow keys, to read the values for each day.
More in MethodologyAll outcomes
| Outcome | TruthIndex™ | Polymarket | Kalshi | Spread | 24h | |
|---|---|---|---|---|---|---|
| RRuss Fulcher | 96.3% | 95.8% | 98.0% | 2.2 pts | – | |
| DKaylee Peterson | 2.5% | 2.7% | 2.0% | 0.7 pts | – |
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Candidates & Background
Kaylee Peterson
Democratic
Kaylee Peterson, a Democrat and artisan jeweler, is her party's nominee for Idaho's 1st congressional district for the third straight election, facing Republican incumbent Russ Fulcher and two other candidates in 2026.
Russ Fulcher
Republican U.S. Representative for Idaho's 1st congressional district (since 2019)
Russ Fulcher, a Republican who has represented Idaho's 1st congressional district since 2019, is seeking re-election in 2026 against Democrat Kaylee Peterson, Constitution Party candidate Brendan Gomez and independent Sarah Zabel.
Margin of victory
Each venue's margin market, shown on its own: the two venues set their ranges differently.
Kalshi1.5K contracts
Idaho's 1st District margin of victory
| Fulcher, 24+ pts | 88.0% | |
| Fulcher, 27+ pts | 79.0% | |
| Fulcher, 30+ pts | 68.5% | |
| Fulcher, 33+ pts | 53.5% | |
| Fulcher, 36+ pts | 37.5% | |
| Fulcher, 39+ pts | 22.5% | |
| Fulcher, 42+ pts | 11.6% | |
| Fulcher, 45+ pts | 4.9% | |
| Fulcher, 48+ pts | 6.1% implied |
Polymarket$14.9K traded
ID-01 House Election Margin of Victory
| Democrat Wins | 0.4% | |
| Republican 0-10% | 3.3% | |
| Republican 10-20% | 9.2% | |
| Republican 20-25% | 19.9% | |
| Republican 25-30% | 21.5% | |
| Republican 30-35% | 23.5% | |
| Republican 35-40% | 25.0% | |
| Republican 40-45% | 4.2% | |
| Republican 45-50% | 4.6% | |
| Republican 50%+ | 3.4% |
Each venue's market
Polymarket$48.7K traded
Prices which party wins.
Russ Fulcher: Counted · bid 94.9% / ask 96.7% · $1.6K within 5 pts
This market will resolve according to the party of the candidate who wins the ID-01 congressional district seat in the U.S. House of Representatives in the 2026 midterm elections. The midterm elections will take place on November 3, 2026. A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time all of the 2026 House elections are conclusively called by this market's resolution sources. A candidate without a ballot-listed affiliation to either the Democrat or Republican parties will be considered a member of one of these parties based on the party with which they most recently expressed their intent to caucus at the time all of the House elections are conclusively called by this market's resolution sources. This market will resolve based on the result of the election as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the United States government, specifically the Federal Election Commission (https://www.fec.gov/).
Full rules on PolymarketKalshi894 contracts traded
Prices which party wins.
Russ Fulcher: Counted · bid 96.2% / ask 99.7% · $502 within 5 pts
Contract shown: Russ Fulcher
If the House member sworn in for ID-01 for the term beginning in 2027 is a member of the Republican Party, then the market resolves to Yes.
This market is eligible for accelerated determination after a consensus of media organizations project the winner. See full rules for details.
Also in Idaho
- Idaho SenateR95%
- Idaho GovernorR97%
- ID-02 HouseR96%