Sam Forstag Hits 39% in MT-01 With No New Polls Behind the Move
Prediction markets have pushed Forstag 12 points higher in three days while structural models hold at 18%. No poll or news event explains the gap.
Bottom line
Traders have pushed Forstag to 39% with no new polling behind it, more than double what structural models project for MT-01.
- Market average
- 30% YES
- Best listed price
- 29¢ · Kalshi
Sam Forstag's chances of winning Montana's 1st Congressional District currently sit at 39% across prediction markets, a number that has surged 12 percentage points in just three days. No new public poll, endorsement, or campaign development explains the move. The gap between what traders are pricing and what structural forecasters project is now 21 percentage points wide, making MT-01 one of the most mispriced races in either direction heading into the fall.
Sam Forstag's Odds of Winning MT-01: What Prediction Markets Say Right Now
Forstag's Democratic Party contract trades at 38% on Kalshi and 40% on Polymarket, averaging 39%. Three days ago that number was 27%. The implied probability of a Republican hold has fallen correspondingly, with Aaron Flint's side now priced near 61%.
Meanwhile, Call the Map gives Forstag only an 18-in-100 chance of winning, with a predicted margin of R+9.6. That model accounts for the district's partisan lean, national environment, fundraising, and incumbency dynamics. It has not moved materially since it was first published. The 21-percentage-point spread between market and model is not explained by any data point either side has access to that the other does not.
The 39% figure raises an obvious question: what actually moved the market? The answer is not a poll or a news event, which makes this surge unusual and worth interrogating.
Why Did Sam Forstag's Odds Jump 12 Points With No New MT-01 Polling?
No confirmed catalyst emerged in the 72 hours covering this move. No new poll was released. No major endorsement dropped. No scandal hit the Flint campaign. The DCCC did add MT-01 to its target list, but that happened in late July, weeks before this price action.
The most likely explanation is mechanical. MT-01 is not a high-volume prediction market. In low-liquidity districts, even modest buying pressure on the Democratic side can push implied probabilities several points. Cross-race correlation effects also matter: if national generic-ballot sentiment shifts or traders reprice the midterm environment broadly, individual district contracts can move in sympathy without district-specific news.
This is a pattern seen repeatedly in House prediction markets. A handful of buyers interpret the DCCC targeting, a competitive June internal poll (which showed the race tied at 44-44 among 500 likely voters, per Impact Research), or the national environment as reasons to buy. In a thin book, that buying moves the price far more than it would in a presidential contract.
The structural forecasters have not budged. Call the Map's R+9.6 margin sits exactly where it has been, and the major race raters (Cook, Inside Elections, Sabato) classify MT-01 as Likely or Lean Republican.
Are There Polls for the MT-01 House Race in 2026?
Only two polls have been recorded for this race, and neither is recent enough to explain the current market. An Impact Research (D) survey from late June 2026 showed the race tied at 44% each among 500 likely voters. An earlier Upswing Research (D) poll from early May, commissioned by 314 Action, showed Flint ahead by five points, 48% to 43%, among 401 likely voters.
Both polls were conducted by Democratic-aligned firms. Neither is an independent public survey. No nonpartisan pollster has fielded a district-level MT-01 poll in this cycle. Call the Map notes these polls but does not incorporate them into its topline forecast, relying instead on its structural model.
This polling vacuum is the central interpretive problem. Prediction markets at 39% are the only real-time signal available for MT-01. But a signal without confirming data is just a price, not a forecast. The 21-point gap between market and model cannot be arbitraged by new information because no new information exists.
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The Case FOR Sam Forstag: What Would Need to Be True for 39% to Hold
For the market to be right and the model wrong, several conditions would need to hold simultaneously. First, the national environment would need to deteriorate further for Republicans. A generic-ballot shift toward Democrats of 3 to 5 points from current levels could narrow the structural lean enough to bring MT-01 into single-digit territory. Second, Forstag would need to outperform his party's brand in the district, something the tied June internal poll hints is possible but no independent survey has confirmed. Third, the DCCC's investment would need to translate into actual spending at scale, not just a target-list designation.
The open-seat dynamic also helps. Ryan Zinke's retirement removed the incumbency advantage that typically adds 3 to 5 points for the defending party. Flint is a first-time nominee running on Trump's endorsement in a district where Trump's brand is strong but not dominant (Cook PVI of R+5, not R+15). If midterm backlash against the party holding the White House is sharper than currently modeled, MT-01 is the type of district that could tighten.
The Case AGAINST: Why Structural Models Still Favor Aaron Flint
The strongest argument against the market's 39% price is the simplest: this district's fundamentals have not changed. Call the Map's R+9.6 margin accounts for the open seat, the national environment, and the candidate field. Even the most favorable Democratic poll showed a tie, not a lead. And that poll was conducted by a Democratic firm in June, before Flint consolidated the Republican base after winning 50% in a four-way primary.
Flint's primary performance was unusually clean for a contested field. Winning half the vote against three opponents, with a Trump endorsement in hand, left no visible factional wound to exploit. Forstag, by contrast, took 37% in a fractured Democratic primary, a less commanding mandate.
The middle-80% simulation range from Call the Map spans R+23.0 to D+3.8. Even at the most optimistic end for Democrats, Forstag barely wins. The median outcome is a comfortable Republican hold. For the market to be correct at 39%, the race would need to land in roughly the bottom fifth of all simulated outcomes.
What Happens Next
MT-01 resolves on November 4, 2026. Between now and then, the only events likely to move both markets and models are new independent polls (none are scheduled publicly), major spending announcements from the DCCC or NRCC, or a candidate-level scandal. Without those, traders and forecasters will continue looking at different versions of reality.
The current 39% price is best understood as a bet on the national environment overwhelming district structure. That bet is not irrational, but it is aggressive. Structural models have a strong track record in districts with R+5 or greater partisan leans, and the absence of confirming poll data makes the market's confidence harder to justify. For live odds and resolution tracking, see the MT-01 House winner odds page.
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The story so far: MT-01 House winner?
8 updates · Jun 30 – Sep 1
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