Polymarket
KalshiPennsylvania's 10th District: The Market Prices Stelson's Rematch With Perry as a Reversal
The Pennsylvania 10th District odds 2026 board is a rematch priced as a reversal: the market treats Janelle Stelson's narrow 2024 loss and her fundraising since as enough to unseat Scott Perry, the Republican who beat her two years ago by about five thousand votes. The seat takes in every precinct of Dauphin County, Harrisburg included, and the venues make the Democrat a solid favorite heading into November 3, 2026, on a board far thinner than the state's other close races. The live board above carries Kalshi's and Polymarket's current prices.
Who Is on the Pennsylvania 10th District Ballot
Dauphin County's official notice of the November 3, 2026 general election, last updated August 4, 2026, lists two candidates for Representative in Congress in the 10th Congressional District, on the ballot in all precincts within Dauphin County: Janelle Stelson, a Democrat, and Scott Perry, a Republican. The same notice places precincts of the City of Harrisburg in the county's state House districts, so the state capital votes in this race.
Perry is the incumbent. The Clerk of the House member list, published October 1, 2026, records Scott Perry, a Republican from Dillsburg, as the member for the 10th District. The Federal Election Commission's list of registered candidates for the district also carries an independent, Isabelle Harman, who reported about $67K in receipts through September 30, 2026; she does not appear on Dauphin County's notice, which lists only Stelson and Perry.
The defining fact of this race is that it has been run before. The Clerk of the House's official statistics for the November 5, 2024 election show Perry with 205,567 votes and Stelson with 200,434, a margin of 5,133 votes out of 406,001 cast, about a point and a quarter. Stelson is back with the same opponent and a known vote total to build on, and Perry is defending a margin that a shift of about 2,600 voters would have reversed.
Why the Pennsylvania 10th District Price Favors Stelson
What the price is saying is that a challenger who came within about five thousand votes in a presidential year, and who has since raised more than Perry has reported, is now the stronger candidate. The fundraising record carries most of that read. Federal Election Commission totals show Stelson's committee with $8.69M in receipts and $6.19M in disbursements through September 30, 2026, leaving $2.52M in cash on hand. Perry's most recent totals, through June 30, 2026, show $5.19M raised, $2.43M spent and $2.85M on hand. The two reports cover different periods, so neither pair of figures is a like-for-like comparison; what they do show is that Stelson had raised about $3.5M more by the end of September than Perry had by the end of June.
A rematch also changes what the 2024 margin means. Perry's 5,133-vote win came in a presidential year; in 2026 the same challenger runs with her name already known to the more than two hundred thousand voters who chose her last time. The market treats the narrow loss as a floor for Stelson rather than a ceiling.
On October 16, 2026, Kalshi and Polymarket both had the Democratic contract at 81%, and both had the Republican contract at 20%. That makes Stelson about a four-in-five favorite, a firmer call than the 2024 margin alone would justify and one that leans heavily on the money. The two venues agreeing to the point on both sides means neither book is pricing this race differently from the other.
The volume is the weak point in that agreement. As of October 16, 2026 the board had drawn about $12.7K on Polymarket, the least of the five Pennsylvania House boards close enough to carry a page here, against about $35K on the 7th District and $36K on the 1st, and it had matched about 38,000 contracts on Kalshi, against about 342,000 and 228,000 on those two. On Kalshi about 23,000 of its contracts sat on the Democratic side and 15,000 on the Republican; on Polymarket the split was about $5.3K to $7.4K. A price set on that little money is a softer number than one set on a heavily traded board, and it can move further on less news.
The Case Against the Pennsylvania 10th District Read
The strongest case against the read is that Perry has already beaten this opponent once. A reader who holds the other view would say that the 2024 result is the best measure of the district available, that it went to the Republican, and that a challenger's money does not turn a 5,133-vote loss into a four-in-five win on its own. Perry also held more cash on hand at his last reported date than Stelson did at hers, so he is not short of resources for the final weeks.
There is no independent general-election poll of the district in the public record cited on this page, so the price is not resting on any measurement of voters in 2026. That leaves the market's confidence carried by the fundraising totals and the rematch logic, both of which are reasonable inputs and neither of which is a count. And the thin volume means the price has been tested by less money than any other close Pennsylvania House price.
The answer the price gives is that a well-funded rematch against a member who won by a point and a quarter is a challenger's race. That is a defensible read; it is not a measured one.
What Changes the Pennsylvania 10th District Read
The read rests on Stelson's money and the narrow 2024 margin. It would be wrong if the next evidence shows Perry holding his 2024 coalition:
• A public poll: The first independent survey of the district before November 3, 2026. A Perry lead would mean the price has run on fundraising alone.
• Perry's next report: The FEC reports covering July through September, once posted for Perry's committee, will put the two campaigns' cash on the same date for the first time this cycle.
• Price on thin volume: With about $12.7K traded on Polymarket and 38,000 contracts on Kalshi, a move of ten points or more on either venue before Election Day would be the market itself changing its read.
• Voter deadlines: registration closed on October 19, 2026, and October 27 is the last day to apply for a mail ballot, which must arrive by 8:00 p.m. on November 3.
• The count: Polls close at 8:00 p.m. on November 3, mail ballots are pre-canvassed starting no earlier than 7:00 a.m. that day, and county boards must certify official returns by November 23, 2026.
When the Pennsylvania 10th District Market Resolves
Kalshi resolves its Democratic contract Yes if the member sworn in for PA-10 for the term beginning in 2027 is a Democrat, and its Republican contract on the same test; it lists an expected settlement of January 4, 2027 and allows accelerated determination once a consensus of media organizations projects the winner. Polymarket resolves on the party of the candidate who wins the seat, as indicated by a consensus of credible reporting, and on the official results reported by the Federal Election Commission if there is ambiguity. A margin as narrow as 2024's would leave both waiting on the county canvass.
Related Pennsylvania Markets
The 10th is one of five Pennsylvania House boards close enough to carry its own page. The others are the Pennsylvania 1st District odds, the Pennsylvania 7th District odds, the Pennsylvania 8th District odds and the Pennsylvania 16th District odds. Dauphin County voters also decide the statewide Pennsylvania governor odds, and the Pennsylvania elections page collects the state's election markets.
