Perry Falls to 18% in PA-10 as Stelson Rematch Takes Shape

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Scott Perry's Reelection Chances Collapse to 18% as Janelle Stelson Rematch Looms in PA-10

Prediction markets give the Republican Party an 18% chance of holding Pennsylvania's 10th Congressional District, with Janelle Stelson, the former WGAL television news anchor who came within striking distance of unseating Scott Perry in their first matchup, advancing to a 2026 rematch. That puts Perry, a 13-year incumbent, at roughly 4-to-1 odds against in a seat he first won in 2013.

The Republican Party's implied probability of holding PA-10 now sits at 18%, down from 27% just three days ago. That 9-percentage-point drop is the steepest short-term decline this contract has recorded. Trading below 20% this far from the November 4, 2026, resolution date is a clear market verdict: traders see structural weakness, not a temporary dip.

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Janelle Stelson (D)

Consensus YES price across 4 venues

82%average

Polymarket USBest YES price80¢Kalshi81¢Polymarket82¢PredictIt88¢

Scott Perry (R)

Consensus YES price across 4 venues

17%average

KalshiBest YES price21¢Polymarket US21¢Polymarket21¢PredictIt36¢

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PA-10 Prediction Market Odds Over Time: How Perry Went From Competitive to Heavy Underdog

The three-day chart tells a story a single snapshot cannot. At 27%, Perry was an underdog but still within the range where a positive polling release or fundraising surge could shift sentiment. At 18%, the market prices him as a long shot.

An 18% implied probability means traders believe Perry wins roughly one in every five versions of this race. Incumbents in competitive districts rarely trade this low in September of an election year unless markets have already absorbed information about candidate quality, fundraising gaps, or national environment. The decline has been orderly rather than the result of a single large block trade, which suggests multiple participants are independently reaching the same conclusion: Perry is in deep trouble.

The platform-level breakdown adds nuance. Kalshi prices the Republican Party at 25%, while PredictIt sits at 10%. That 15-point gap means the platforms are not in agreement about how heavy an underdog Perry is, though both clearly favor the Democrat.

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Are There Polls for the PA-10 Race in 2026? What Public Data Says About Perry vs. Stelson

Readers searching for polls on the Perry-Stelson rematch will find very little. As of mid-September 2026, no major public polling outfit has released a head-to-head survey of the PA-10 race this cycle. That absence is itself informative: pollsters allocate resources toward races where competitiveness is already established, and the lack of data creates an information vacuum that prediction markets are filling.

When public polls do not exist, prediction market prices become the most granular real-time signal available. Traders on platforms like Kalshi and PredictIt are synthesizing fundraising filings, early voter registration data, candidate favorability, and the national political environment into a single number. Right now, that number says Perry is losing.

What we do know from their 2024 contest is that Stelson, a well-known Central Pennsylvania media figure, proved she could compete in a district redrawn after the 2020 census. Perry's margin was narrow enough to trigger national interest in the rematch. Stelson running again with the infrastructure and name recognition from a prior campaign is a material advantage that markets are clearly weighing.

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Is PA-10 a Swing District? The Structural Case Against Perry

Pennsylvania's 10th District, centered on the Harrisburg suburbs and parts of York and Cumberland counties, has evolved from a safely Republican seat into one of the most closely watched battlegrounds in the country. Post-redistricting, the district's partisan lean shifted toward Democrats, and Perry's personal brand carries liabilities a generic Republican would not. His involvement in efforts to challenge the 2020 election results, including interactions with the Department of Justice that drew scrutiny from the January 6th committee, has made him a polarizing figure even within his own party.

Axios reporting indicates that House Republicans have been making triage decisions about where to allocate campaign funds, pulling money from certain swing seats. While that specific reporting focused on New York's 19th District, it reflects a broader pattern of the NRCC prioritizing races where their dollars stretch furthest. If PA-10 is being deprioritized in a similar fashion, that would explain why prediction markets are moving so aggressively against Perry.

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The Case for Perry: What Would Need to Be True for 18% to Be Wrong

Any honest market analysis must confront the counter-argument. Perry has won this district multiple times, including cycles where national conditions favored Democrats. He has a grassroots base of supporters who turn out reliably, and incumbency still carries advantages in name recognition, franking privileges, and constituent services.

For 18% to be too low, several things would need to break Perry's way simultaneously. A strong Republican national environment, driven by dissatisfaction with Democratic governance or an economic downturn, could lift all GOP candidates. Stelson could underperform her 2024 campaign if she struggles to consolidate Democratic turnout in a midterm year. And Perry could benefit from the presence of two independent candidates, Isabelle A. Harman and Fogel G. Shimp, if they draw more from Stelson's coalition than from his.

None of these scenarios is implausible. But the market's 18% price suggests traders view them as unlikely to converge. The burden of proof has shifted: Perry now needs to demonstrate that the race is closer than the money says it is.

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What Happens Next in the PA-10 Market

This contract resolves on November 4, 2026, giving traders nearly eight weeks to adjust. The next catalysts to watch include any public polling releases, FEC quarterly fundraising reports, and whether national Republican committees direct money toward PA-10 or continue to triage elsewhere. Each of these data points will either confirm or challenge the 18% price.

For readers tracking live odds, the PA-10 House race market carries real-time pricing from both Kalshi and PredictIt. Right now, the direction is unmistakable: traders are betting that Scott Perry's 13-year hold on this district is nearing its end.