Michigan Senate 2026 is the seat Democrats have to hold while hunting four Republican flips, and it is open for the first time since 2014 after Gary Peters chose not to run again. Progressive Democrat Abdul El-Sayed faces Republican Mike Rogers, who lost Michigan's other Senate seat by about 18,400 votes in 2024. Roughly $8.1M has traded across Kalshi and Polymarket, and voting ends November 3, 2026. Current cross-platform prices are on the live board above.
Michigan is the seat Democrats have to hold while they hunt four Republican flips, and it is open for the first time since 2014. Gary Peters announced in January 2025 that he would not seek a third term, and the scramble that followed has produced the most expensive campaign in the state's history. The general election pits progressive Democrat Abdul El-Sayed, the former Wayne County health director, against Republican Mike Rogers, the former congressman who lost Michigan's other Senate seat by roughly 18,400 votes in 2024. Voting ends November 3, 2026. Roughly $8.1M has traded on the two party contracts across Kalshi and Polymarket, and the live board above carries the current cross-platform price on each side.
The polling here is close to a coin flip. Decision Desk HQ's average had El-Sayed ahead by 3.6 points as of October 9, 2026, and the October surveys underneath it are tighter still: InsiderAdvantage 48% to 46%, Quantus Insights 48% to 47%, YouGov 49% to 48%, with Wedgewood Polls the outlier at 53% to 47%. The forecasters split accordingly. Cook Political Report called it a Tossup on October 6, Sabato's Crystal Ball had Lean D the same day, Inside Elections had Tilt D on October 1, and Decision Desk HQ had Lean D on October 7.
The board sits noticeably to the Democratic side of that polling margin, and the reason is structural rather than survey-driven. No Republican has won a Michigan Senate seat since Spencer Abraham in 1994, a 32-year drought. Midterm electorates have historically punished the party that holds the White House. And 2026 is a non-presidential year, which matters because Trump carried Michigan by only 1.4 points in 2024 on a presidential turnout map, and the low-propensity half of that coalition is the hardest part of Rogers' math to reproduce without a presidential race on the ballot.
Our read, and this is opinion rather than data: the premium on the Democratic contract is a bet on the midterm environment, not on the Michigan polling. That makes it a cleaner trade than it looks if you believe in out-party midterm turnout, and a poor one if you think this race ends the way 2024 did, with late-deciding independents breaking Republican inside the margin of error. The board's Democratic lean on the U.S. Senate control market is built partly on Michigan holding, so the two prices move together.
El-Sayed won the August 4 primary with 48.5% of the vote, beating Representative Haley Stevens by less than a point after state Senator Mallory McMorrow withdrew in July. Bernie Sanders endorsed him. His fundraising has been the better of the two on a gross basis, $14.5M raised through July 15 against Rogers' $10.9M, but he went into the general with $2.6M on hand to Rogers' $4.5M, and that is the gap that shows up on television.
His path is arithmetic, not persuasion. He needs the Stevens and McMorrow Democrats to consolidate behind a nominee who won a plurality rather than a majority, he needs the Wayne, Oakland and Washtenaw county margins that any statewide Michigan Democrat requires, and and he needs the Arab American and younger voters who are central to any statewide Democratic coalition in a state Trump carried by 1.4 points in 2024. He has leaned into the issue that divided that coalition: asked at the October 8 debate in Grand Rapids about weapons for Israel, he said he did not want tax dollars being used to subsidize war abroad.
The risk is that he is the most left-leaning Senate nominee Michigan Democrats have put forward in the modern era, in a state Trump just carried. Trump's pre-debate attack on his religious identity, posted to Truth Social, is a reasonable preview of the closing three weeks.
Rogers has the single best piece of evidence in the race, which is that he already ran this state to within a rounding error. In 2024 he took 48.3% to Elissa Slotkin's 48.6%, about 18,400 votes short. He was unopposed in the August primary, carries Trump's endorsement, and spent the whole summer on general-election footing while the Democratic field fought.
He has also been running at a deliberate distance from parts of the administration. At the October 8 debate he criticized the Canada tariffs and said he had called the White House to negotiate a settlement, said the conflict with Iran needs to come to an end, and called ICE's operations in Minnesota probably not appropriate. Pair that triangulation with a near two-to-one advertising advantage from his campaign and allied outside groups, and the Republican case is coherent: a known statewide quantity, better funded on air, running against a nominee the other side's moderates did not pick.
The risk is the same one the board is pricing. The voters who got him to 48.3% arrived in a presidential year. A midterm electorate in Michigan is a different, older, more Democratic-leaning body of voters, and no amount of ad spending has solved that for a Michigan Republican since 1994.
The election is November 3, 2026. The market resolves to the party of the winner of the Michigan U.S. Senate race, inclusive of any runoff. A candidate represents a party by being that party's nominee, so a replacement nominee inherits the contract, and a candidate running as an independent counts for neither party regardless of affiliation. Four minor-party candidates are on the ballot, Libertarian Lydia Christensen, Green Douglas P. Marsh, U.S. Taxpayers' Tim Long and Natural Law's Walter P. Kristy, and additional contracts for them may be listed later. Resolution follows the Associated Press, Fox News and NBC: the market settles once all three call the race for the same candidate, and otherwise on official certification.
Michigan is one leg of a chamber-wide trade, so price it against which party wins the U.S. Senate and the Congress balance of power board, which pays on the House and Senate combination rather than either chamber alone. The other open-seat and incumbent tossups worth lining up next to it are the Texas Senate winning party market and the Maine Senate race, the Democrats' best offensive opportunity on the map. For the other chamber, the U.S. House control board carries the largest volume of any 2026 political market on the site.
Resolves to the party of the winner of the 2026 Michigan U.S. Senate election held November 3, 2026, inclusive of any runoff. A candidate is treated as representing a party only by being that party's nominee, so if a named candidate is replaced before election day the contract follows the replacement nominee. A candidate running as an independent resolves for neither the Democratic nor the Republican contract regardless of any party affiliation. Minor-party candidates on the Michigan ballot (Libertarian Lydia Christensen, Green Douglas P. Marsh, U.S. Taxpayers' Tim Long and Natural Law's Walter P. Kristy) are not covered by the two party contracts and may be listed as separate contracts later. The resolution sources are the Associated Press, Fox News and NBC: the market settles once all three call the race for the same candidate, and otherwise on the official state certification.
The live board above shows the current price on both the Democratic and Republican contracts on Kalshi and Polymarket. The two sides have traded roughly $8.1M in cumulative volume between them.
Election day is November 3, 2026. The market settles once the Associated Press, Fox News and NBC all call the race for the same candidate, and otherwise on the official state certification.
Kalshi lists it under the SENATEMI-26 event and Polymarket lists it as the Michigan Senate election winner. Both venues quote a Democratic and a Republican contract, so you can compare the two prices side by side on the board above.
Decision Desk HQ's polling average had Democrat Abdul El-Sayed ahead of Republican Mike Rogers by 3.6 points as of October 9, 2026. Cook Political Report rated the race a Tossup on October 6 while Sabato's Crystal Ball had it Lean D.
Absentee return data out of Wayne, Oakland and Macomb counties, whether El-Sayed closes an advertising gap that has run near two to one against him, and any forecaster move off Cook's Tossup rating in the three weeks before November 3, 2026.