Bohannan Leads IA-01 by 5 Points as Miller-Meeks Odds Fall to 26%

Christina Bohannan leads incumbent Mariannette Miller-Meeks by approximately 5 points in the IA-01 polling average, according to Call the Map's September 12 forecast, which aggregates available surveys and modeling inputs. A July 2026 Bullfinch Group poll showed Bohannan at 40% and Miller-Meeks at 35% among likely voters, with independent candidate Michael Bridgford pulling 11%. Multiple forecasters now give Bohannan between a 69% and 70% probability of flipping the seat.

That polling picture has driven a sharp repricing in prediction markets. Republican Party contracts for the IA-01 House winner market have fallen from 34% to 26% in just three days, implying that traders see Miller-Meeks as a clear underdog to hold a seat she won by 8 points in 2024.

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Christina Bohannan (D)

Consensus YES price across 4 venues

83%average

Polymarket USBest YES price82¢Kalshi83¢Polymarket83¢PredictIt89¢

Mariannette Miller-Meeks (R)

Consensus YES price across 4 venues

18%average

KalshiBest YES price18¢Polymarket18¢Polymarket US21¢PredictIt40¢

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Christina Bohannan Leads IA-01 by ~5 Points as Forecasters Give Her 70% Win Probability

The proof point here is hard to dismiss. Miller-Meeks defeated Bohannan roughly 54%-46% in 2024, an 8-point margin that, in a competitive district, looked like a settled result. Call the Map's September 2026 model now gives Bohannan a 69-in-100 chance of flipping that same seat, with a predicted margin of D+2.8. Smarter.Vote's forecast is even more bullish on Bohannan, estimating a D+4.0 margin and a 70% win probability.

Only two polls are in the public record for this cycle, but both point the same direction. The Bullfinch Group survey (July 2026, 705 likely voters) showed Bohannan ahead by 5 points. An earlier Public Policy Polling survey (June 2025, 555 registered voters) had Bohannan up by 4. Neither is a recent September sample, but the consistency across pollsters and timeframes has given forecasters enough signal to build a model around a Democratic lean.

This is not a slow drift. Bohannan's advantage has hardened in modeling outputs even as the race has been relatively quiet on the campaign trail. The question for markets is whether polling averages or the 2024 baseline are the better predictor.

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IA-01 Prediction Market Odds for Republicans Collapse 9 Points in Three Days

The speed of the market move is what distinguishes this from routine midterm repricing. Republican Party contracts dropped 9 percentage points in 72 hours, touching a period low of 24% before recovering slightly to 26%. Kalshi prices the Republican outcome at 28%; Polymarket prices it at 23%. That 5-point spread between platforms is notable, suggesting the sell-off has been somewhat uneven and that price discovery is still in progress.

To put 26% in context: it means traders believe Miller-Meeks has roughly a 1-in-4 chance of holding a seat she won by 8 points just two years ago. That is a full structural reversal in implied probability, not a marginal adjustment. The market and Call the Map's model are now within 5 points of each other (26% vs. 31%), which suggests both are responding to the same underlying polling signal rather than diverging on fundamentals.

The catalyst for the three-day move is not entirely clear. No major poll dropped during the September 10-13 window, and Call the Map's own forecast was steady over those dates (its margin moved 0.0 points between September 10 and September 12). It is possible that traders were slow to incorporate the July polling data or that a cluster of informed participants updated their positions simultaneously. Either way, the market has caught up to where forecasters have been pointing for weeks.

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What's Driving the Shift? Structural Headwinds Facing Miller-Meeks in 2026

Several factors explain why an 8-point 2024 win may not protect Miller-Meeks. First, the national environment: midterm elections historically punish the president's party, and IA-01 is exactly the kind of suburban-leaning, college-educated district where that dynamic tends to bite hardest. Miller-Meeks' 2024 margin was built partly on presidential-year turnout patterns and coattail effects that will not replicate in a midterm cycle.

Second, Bohannan is not a generic challenger. She ran this district in 2022, losing by fewer than 7 points in a cycle that was broadly unfavorable to Democrats. She ran again in 2024 and closed the gap only modestly, but the experience gave her a built-in name-recognition advantage and a proven fundraising network. Call the Map's model attributes 4.3 margin points to polling and 1.3 to the national environment, meaning the race-specific signal (Bohannan's personal strength and Miller-Meeks' vulnerabilities) is doing most of the work.

Third, Michael Bridgford's independent candidacy adds a wildcard. The Bullfinch Group poll showed him at 11%, and while Call the Map allocates only about 1% of vote share to "Other" in its simulations, any credible third candidate creates uncertainty about where those votes ultimately land. If Bridgford draws disproportionately from Republican-leaning independents, Miller-Meeks' effective margin shrinks further.

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The Case for Miller-Meeks: Why 26% Might Be Too Low

The strongest counterargument is the August 2026 Psephologix projection, which gave Miller-Meeks an 84% chance of winning with a predicted margin of R+6.9. That forecast was published August 7, roughly five weeks before the current market price, and it points to a fundamentally different interpretation of the district's lean. Psephologix weights the district's measured terrain more heavily (Call the Map shows a measured terrain input of R+8.3), and if that structural Republican lean reasserts itself as turnout patterns solidify closer to Election Day, the current market could be overcorrecting.

There is also the polling sample problem. Only two public polls exist for this cycle, and the most recent is from July. Midterm polling in individual House districts is notoriously sparse and volatile. A single high-quality September poll showing Miller-Meeks within 2 points could snap Republican contracts back above 35% overnight. Markets built on thin polling foundations are fragile in both directions.

Call the Map's own 80% simulation range spans from R+4.6 to D+10.2, a 15-point band that illustrates how much uncertainty remains. A 26% implied probability for Miller-Meeks is not unreasonable given the polling average, but it leaves little room for the possibility that summer polls overstated Bohannan's support or that Republican turnout operations close the gap in October.

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What Comes Next for the IA-01 Market

The November 4, 2026 resolution date is 51 days away. Fresh polling will be the primary mover. If a September survey confirms Bohannan's 5-point lead, Republican contracts will likely drift toward 20% or lower. If Miller-Meeks closes to within 2 points, the Kalshi-Polymarket spread (currently 28% vs. 23%) could converge upward toward 35%.

For now, the market and the major forecasting models are telling a consistent story: IA-01 is a Democratic-leaning race, not a toss-up. Full live odds for every outcome are available on the IA-01 House winner market page. Whether the 2024 baseline or the 2026 polling average proves more predictive will determine if 26% was a fair price or a midterm overreaction.