Maine Senate race odds 2026: Collins vs. Jackson
Republican Susan Collins, who has held the seat since 1997, faces Democrat Troy Jackson in one of the closest Senate races of 2026.
Troy Jackson (D) wins
The markets
Who will win the Maine Senate race?
| Outcome | Kalshi | Polymarket | Average |
|---|---|---|---|
| Troy Jackson (D) | 60% | 60% | |
| Susan Collins (R) | 40% | 40% |
What to know
- Incumbent: Collins won in 2020 even though most polls showed her behind, a reminder that Maine polling has missed before.
- Ranked-choice voting: Maine uses ranked-choice voting in federal general elections, so second preferences can decide a close race.
- Election day is Tuesday, November 3, 2026. Odds usually move most in the final weeks, on polls, early-vote data and news. See all races on the 2026 midterms page.
How these markets resolve
- Kalshi, “Maine Senate winner?”: If a representative of the Republican party is sworn in as a Senator of Maine for the term beginning in 2027, then the market resolves to Yes. Full rules
- Polymarket, “Maine Senate Election Winner”: This market will resolve according to the winner of the 2026 midterm Maine 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. Full rules
How to read these odds
A price of 30¢ on a contract that pays $1 means the market puts the event at roughly 30%. Prices move with supply and demand, include fees and spreads, and can lean on long shots. When the two markets disagree by more than a few points, check whether their rules or deadlines differ. More in how prediction markets work and the favorite-longshot bias.
FAQ
Who is favored in the Maine Senate race?
As of Sep 30, 2026, Kalshi prices it at 60% and Polymarket prices it at 60%. These are market prices, roughly the probability traders are willing to bet on, not a guarantee.
Why do Kalshi and Polymarket show different odds?
They are separate markets with different traders, fees and sometimes different rules or deadlines. A gap of a few points is normal; a large gap is worth checking against each market's rules.
How often are these odds updated?
Sikt refreshes this page from Kalshi's and Polymarket's public data several times a day. The time of the last update is shown at the top.
Are prediction market odds accurate?
Often, but not uniformly. Research on Kalshi finds prices are informative and improve as a market nears its close, but long shots tend to be overpriced (the favorite-longshot bias).
Market data from the public Kalshi and Polymarket APIs, shown for information only. Prices are midpoints or last trades and can be several hours old. Sikt Intelligence is not affiliated with Kalshi or Polymarket. Not financial or investment advice.