Polymarket
KalshiTX-17 Lost Eight Points to the Redraw and Is Still Priced as a Republican Hold
TX-17 House race odds rest on a margin the 2026 redraw cut by about eight points and did not come close to erasing. Under PlanC2333, the congressional plan the Texas Legislative Council lists as in effect for the 2026 elections, the district gave up Angelina, Nacogdoches and four other counties and took in 49% of Williamson County, and on November 5, 2024 the Republican Senate nominee still carried the new lines by 17.4 points, down from 25.3 under the old ones. Texas voters decide the seat on November 3, 2026, with early voting running through October 30. The market treats TX-17 as a Republican hold because a smaller margin is still a wide one and the sitting member is on the ballot. The live board above has the current number.
What the TX-17 price is saying
In TX-17 the redraw changed the district's shape more than its lean, and the price rests on the second fact. The previous plan, PlanC2193, combined McLennan County with all of Angelina, Houston, Leon, Nacogdoches and Trinity counties, 78% of Walker County, 5% of Travis County and 14% of Williamson County, 86,834 people. PlanC2333 drops Angelina, Houston, Leon, Nacogdoches, Trinity and Walker counties and the Travis share. It keeps McLennan, Falls, Limestone, Milam and Robertson counties whole, takes all of Freestone County instead of 36%, adds all of Bosque and Hill counties with 9% each of Bell and Johnson counties, and raises the Williamson share to 49%, 301,007 people on the 2020 Census figures in the council's report of August 18, 2025. Williamson is now the largest piece of the district, ahead of McLennan County's 260,579.
On the council's population report of August 18, 2025, the new district is 55.1% Anglo, 24.4% Hispanic, 12.3% Black and 6.5% Asian, against 53.0% Anglo, 25.3% Hispanic, 17.0% Black and 3.3% Asian under the old lines. The Asian share doubled and the Black share fell by almost five points, changes that came with the counties traded in and out, which means the seat now votes with a different electorate, and that is why the margin moved.
The 2024 returns recomputed inside the new lines put numbers on it. On November 5, 2024 the Republican presidential ticket carried the 2026 version of TX-17 by 60.0% to 38.4%, 192,397 votes to 123,153, and the Republican Senate nominee by 57.5% to 40.1%, 183,240 to 127,734, on the council's election analysis. Inside the old lines the same contests went 64.0% to 34.8% and 61.6% to 36.3%. The presidential margin fell from 29.2 points to 21.6 and the Senate margin from 25.3 to 17.4. Down the ballot, Republican statewide candidates ran between 60.1% and 63.3% inside the new lines. A district where the weakest Republican result of 2024 was a 17-point win is a district the market can price as safe even after losing eight points to a redraw, and that is what the price is saying.
The name on the Republican line is the sitting member's. Pete Sessions of Waco, a Republican sworn in on January 3, 2025 according to the Clerk of the House's member list for the 119th Congress, won the seat on November 5, 2024 with 193,101 votes, 66.35%, to 97,941, 33.65%, for the Democratic nominee, Mark Lorenzen, on the old lines. That means the incumbent is defending a seat he won by 32.7 points on a map that, at the top of the ticket, was about eight points more Republican than the one on the 2026 ballot. He was unopposed in the March 3, 2026 Republican primary, which drew 59,724 votes.
The Democratic nomination took two rounds. In the March 3, 2026 primary three candidates split 47,972 votes, with Casey Shepard second at 15,552, 32.42%, behind the first-round leader's 42.57%; Shepard won the May 26, 2026 runoff with 5,122 votes, 59.88%, of 8,554 cast, on the Secretary of State's official canvass, and Ballotpedia lists the runner-up as having unofficially withdrawn before the runoff. The Secretary of State's qualified-candidate list for the general election carries two names: Sessions for the Republican Party, who filed on November 18, 2025 and lists his occupation as member of Congress, and Shepard for the Democratic Party, an attorney who filed on December 5, 2025. With no third-party candidate on the TX-17 line, the seat is a straight two-way contest.
Money and the raters both point the same way. Ballotpedia's table of Federal Election Commission data showed Sessions with $1.28M raised, $683K spent and $1.04M on hand through September 30, 2026, and Shepard with $93.5K raised, $11.0K spent and $78.2K on hand through October 14, 2026, the close of books for the pre-general report. As of the week of October 20, 2026, the Cook Political Report and Inside Elections rate TX-17 Solid Republican and Sabato's Crystal Ball and Decision Desk HQ rate it Safe Republican. Decision Desk HQ moved the race to Likely Republican for the week of September 29, 2026 and back to Safe a week later, the one rating wobble of the cycle, and no independent public poll of the district appears on the race page.
The price path is a climb that came late. Polymarket's Republican contract opened in late January 2026, printed a low of 48.5% on February 2, sat between 82.5% and 84.5% on primary day, March 3, on May 1 and on runoff day, May 26, and was still 83.5% on July 1. It reached 88.5% on August 1, 93% on September 1, 94.5% on October 1 and a high of 96.7% on October 21, 2026. The Democratic contract printed 16% on March 3, 13.5% on May 26, 11.5% on August 1 and a low of 1% on August 28. On October 23, 2026 the best price on the Republican contract was 97%, on Polymarket, against 98% on Kalshi, and the best price on the Democratic contract was 4%, on Polymarket, against 5% on Kalshi. The market spent the spring pricing the Democratic side at 13.5% to 16% on the new lines and has since decided the eight points the redraw took were not enough to matter.
The trading has a lopsided shape. Kalshi's KXHOUSERACE-TX17-26 series had traded about 30,100 contracts by October 23, 2026, 24,500 of them on the Democratic side and 5,700 on the Republican side, while Polymarket's event had matched about $52.7K, split almost evenly between the two contracts. More contracts changing hands on the cheap side of a lopsided race is what low-priced contracts attract, which means the volume is not a sign of a closer race than the returns show.
The case against the TX-17 read
The case against the read starts in Williamson County. The part of it now in TX-17 holds 301,007 people, 39% of the district on the council's report of August 18, 2025, and the old district held only 86,834 Williamson residents, so at least 214,173 people in the district's largest county are voting on this seat for the first time. The 2024 margin the price leans on was set in a presidential year, with 64.7% turnout inside the new lines, while the November 2022 midterm drew 46.7% of 513,000 registered voters in the same lines. A reader who holds the other view says a district that moved eight points in one redraw is a district whose newest voters are the least Republican part of it, that a midterm decides how much of that shows up, and that 97% leaves almost no room for either.
The price path makes a narrower version of the same case. Polymarket held the Republican side between 82.5% and 84.5% through the spring on these same lines, with the same two candidates in place after May 26, 2026; the climb to 97% came over the summer and early fall without a rating change outside the one week Decision Desk HQ spent at Likely. A contract that rose about fourteen points with the map and the ballot unchanged has priced in a quiet campaign, and a campaign can stop being quiet.
What changes the TX-17 read
The read is wrong if the redraw's eight points turn out to be the start of a larger move. These are the dated things that would show it.
• The Democratic contract on Kalshi above 15%: the best price on it was 4%, on Polymarket, on October 23, 2026, with Kalshi at 5%; a move above 15% on either venue before election day would put the seat back where the market had it in the spring.
• The Williamson County early vote, October 19 to October 30, 2026: 301,007 of the district's 766,987 people are in its part of Williamson County, so turnout there against McLennan County is the first read on whose electorate decides the seat.
• The pre-general reports, books closed October 14, 2026: Shepard's showed $78.2K on hand against Sessions's $1.04M at the end of September; outside spending in the district after October 14 would be the first sign that anyone with money sees a race.
• A second rating move: Decision Desk HQ went to Likely Republican for one week from September 29, 2026; a move off Solid or Safe by any rater before November 3 would be new information the price has not had.
When the TX-17 market resolves
Texas holds the general election on Tuesday, November 3, 2026, after early voting from October 19 through October 30 and a voter-registration deadline of October 5, 2026; October 23, 2026 is the last day for a mail-ballot application to be received. Polymarket's TX-17 House Election Winner contracts resolve on the party of the candidate who wins the seat, by ballot-listed affiliation at the time all 2026 House elections are conclusively called by a consensus of credible reporting, with the Federal Election Commission's official results as the tiebreaker if reporting is ambiguous; the event's listed end is November 4, 2026 at 04:59 UTC, which is 11:59 p.m. Central on election night. Kalshi's KXHOUSERACE-TX17-26 contracts pay Yes if the House member sworn in for TX-17 for the term beginning in 2027 belongs to the named party, allow accelerated determination once a consensus of media organizations projects the winner, expect settlement on January 4, 2027 and carry a latest expiration of November 3, 2027.
Related TX-17 markets
Another Republican seat this site follows is the Texas 21st District market, an open Republican seat west of Austin and San Antonio where the sitting member is not on the ballot. The Texas 26th District market is the counterexample, a Republican seat the redraw left almost untouched, and the statewide race on the same ballot is the Texas Senate market. The elections page lists every Texas race with a contract, the Texas politics hub carries the full set of state boards, and the markets catalog has the rest of the Texas inventory.
