2026 Senate Odds: Every Toss-Up Midterm Race

Less than three months before Election Day, prediction markets see the fight for the Senate as virtually even.

Republicans currently control 53 seats, while Democrats and the two independents who caucus with them account for 47. Democrats, therefore, need a net gain of four seats to win an outright majority. Kalshi traders currently give Republicans a 51% chance of retaining control and Democrats a 49% chance of taking the chamber.

That narrow divide rests on a small group of competitive state races. On Kalshi’s Senate map, five states are shown as toss-ups: Alaska, Iowa, Michigan, Ohio, and Texas. The designation means neither party has established a decisive advantage, although Iowa sits directly on the boundary, with Republicans trading at 55%.

These prices are snapshots of the latest trades and may not reflect current prices at the time of publication.

Alaska: Peltola Tests the State’s Republican Baseline

Former Democratic Rep. Mary Peltola has transformed what would ordinarily be a comfortable Republican defense into one of the most unusual races of the cycle.

Peltola became the first Alaska Native elected to Congress when she won the state’s at-large House seat in 2022. She lost reelection in 2024, but only by roughly 2.5 percentage points, even as Donald Trump carried Alaska by about 13 points. That degree of crossover support explains why traders are willing to favor her against two-term Republican Sen. Dan Sullivan.

Sullivan remains a formidable incumbent. He won reelection with 54% of the vote in 2020, and Alaska has not elected a Democrat to the Senate since 2008. Still, Peltola’s personal popularity and Alaska-focused political identity make her considerably stronger than a generic Democratic nominee. The Cook Political Report moved the race into its toss-up category this summer.

Before the general election takes shape, Alaska will hold its all-party primary on August 18. The top four candidates advance to a ranked-choice general election. The primary has also attracted national attention because another Republican candidate named Dan Sullivan is appearing on the same ballot as the incumbent, creating the possibility of voter confusion. The Associated Press reported on the dispute surrounding the namesake candidacy.

Iowa: An Open Seat in a State That Has Moved Right

Republicans remain slight favorites in Iowa, where Rep. Ashley Hinson is facing Democratic state Rep. Josh Turek for the seat being vacated by Sen. Joni Ernst.

Iowa’s political trajectory favors Hinson. Ernst first captured the seat in 2014, and the state has moved steadily toward Republicans in presidential elections. Hinson also begins the general election with an established congressional profile and strong national party support.

The absence of an incumbent, however, gives Democrats an opening. Turek, a Paralympic gold medalist and state legislator, won the Democratic primary with approximately 63% of the vote. An August Emerson College survey found Hinson leading only 48% to 45%, with 6% undecided. The poll also showed Democrat Rob Sand leading Iowa’s open gubernatorial race, raising the possibility that a competitive contest for governor could improve Democratic turnout across the ticket.

Kalshi’s 55% Republican price captures that tension. Iowa is no longer a conventional swing state, but an open seat and a credible Democratic nominee have prevented the race from moving safely into the Republican column.

Michigan: A Democratic-Leaning Market Despite Difficult Polling

Michigan is the only one of the five states where Democrats are defending an existing seat. Sen. Gary Peters’ retirement created an open contest between Democrat Abdul El-Sayed and Republican Mike Rogers.

Rogers came remarkably close to winning Michigan’s other Senate seat in 2024, losing to Elissa Slotkin by less than half a percentage point while Trump carried the state. That result gave Republicans confidence that he could perform well in another statewide campaign.

El-Sayed reached the general election through a very different route. The progressive former Detroit health director narrowly defeated establishment-backed Rep. Haley Stevens in the Democratic primary. He prevailed by less than one percentage point despite being substantially outspent, according to the Associated Press.

The early general-election evidence is mixed. A recent Fox News survey placed Rogers ahead 51% to 47%, while Kalshi continues to favor El-Sayed and the Democrats at 57%. That divergence makes Michigan especially interesting from a market perspective. Traders appear to be placing greater weight on the expected national midterm environment and Michigan’s recent Senate history than on one unfavorable post-primary poll.

Ohio: Sherrod Brown Attempts a Senate Return

Ohio’s special election is effectively a contest between the state’s Republican trend and Sherrod Brown’s enduring political brand.

Republican Jon Husted was appointed to the Senate in January 2025 after JD Vance became vice president. The winner in November will complete the remaining two years of Vance’s term.

Brown represented Ohio in the Senate for 18 years before losing to Bernie Moreno in 2024. Although Ohio has moved sharply toward Republicans in federal elections, Brown has retained a reputation as an economic populist with unusually strong ties to organized labor and working-class voters.

Recent polling helps explain why Kalshi’s Democratic contract trades at 51%. A Fox News poll conducted from August 6 to 10 found Brown leading Husted 53% to 45%, although broader polling averages remain considerably closer. RealClearPolitics currently shows the two candidates separated by less than one percentage point.

Ohio is therefore testing whether candidate familiarity can overcome a state’s underlying partisan alignment. Brown may be the strongest Democrat available, but he is running in a state Trump won by approximately 11 points in 2024.

Texas: Paxton and Talarico Make the Unlikely Competitive

Texas has attracted more trading activity than any other competitive Senate contest, with approximately $8.7 million in combined volume across Kalshi’s two-party contracts.

Attorney General Ken Paxton reached the general election after defeating four-term Sen. John Cornyn in the Republican runoff. Paxton’s victory demonstrated his strength with the Republican base, but his history of legal, personal, and intraparty controversies has made the general election less predictable than Republicans would prefer.

Democrats nominated state Rep. James Talarico, a former public-school teacher and seminary student who has developed a national following through his discussions of religion, education, and economic inequality. Texas has not elected a Democrat to statewide office since 1994, but Talarico is attempting to assemble a coalition of younger voters, suburban moderates, and the state’s growing Black and Latino electorates.

The latest Emerson College poll found Paxton ahead by only one point, 47% to 46%, among likely voters. Other recent Texas polling has similarly shown a close contest. Kalshi traders remain marginally more confident in Republican fundamentals, pricing Paxton’s party at 51% and the Democrats at 48%.

The Narrow Path to Senate Control

The five competitive Senate states do not occupy identical positions on the Senate battlefield. Michigan is a Democratic-held seat that the party cannot afford to lose. Alaska, Iowa, Ohio, and Texas are Republican-held opportunities that Democrats hope to convert into the four-seat net gain required for control.

Democrats are already heavily favored by Kalshi in North Carolina, another Republican-held open seat. If that anticipated pickup occurs and Democrats defend their existing seats, they would still need to capture three of the four competitive Republican states.

That arithmetic explains why a race in a traditionally Republican state such as Alaska or Texas can become central to the national outcome. No individual market will determine control of the Senate, but a modest shift in any one of them could materially alter the path available to both parties.