2026 Midterms: Senate Control Is Down to Six Live Seats

The 2026 midterms are 22 days out and the prediction markets have stopped pricing them as one election. A Democratic House trades at 90c on Kalshi and 91c on Polymarket across $70.7M in lifetime volume, which is not a forecast so much as a closed file. Everything still genuinely in dispute sits in the Senate, and inside the Senate it sits in six races.

The 2026 Midterms House Board Stopped Being a Question

The 2026 U.S. House Control odds carry two legs and no suspense. Democrats are 90c on Kalshi and 91c on Polymarket. Republicans are 11c and 10c. The paired legs sum above 100 on both venues, which is the book's spread, so both sides read a touch rich and the honest read of the board is a Democratic majority somewhere around 90%.

The volume tells the same story from the other direction. The Republican leg has absorbed $35.9M of lifetime Kalshi volume against $18.2M on the Democratic leg, and $736.7K of the last 24 hours against $344.8K. That is what a settled board looks like: the cheap side churns because it costs almost nothing to hold, and the expensive side barely trades because nobody is arguing. Resolution needs 218 of 435 seats.

2026 Midterms Senate Control Is a Four-Seat Chain

The Senate is the live chamber. Democrats trade at 62c on Kalshi and 64c on Polymarket. The Republican side quotes 39c on Kalshi, and Polymarket prices it through the NO side of the Democratic leg at 37c rather than listing its own row, so the Republican number is one venue plus one derived quote, not a two-book consensus. Lifetime volume is $17.9M.

Per 270toWin's 2026 Senate map, 35 seats are up, 22 of them Republican-held, and Democrats need a net gain of four against a 53-47 chamber. The state boards name those four exactly: Texas at 63.5c, the Ohio special at 61c, Maine at 58.5c, and Alaska at 74c, all four Republican-held, with no Democratic-held seat priced as a likely loss.

Here is the part worth sitting with. Multiply those four Democratic legs together and the chain prices at roughly 17%. The chamber trades at 63c. The gap is correlation: these seats move on one national environment, not four independent ones, and there are substitute paths through Kansas at 38.5c and Iowa at 42.5c if one of the four fails. Anyone reading the chamber price as the product of the state prices is reading it wrong by a factor of nearly four.

Texas Is the Biggest Single Board of the 2026 Midterms

Texas Senate Winning Party 2026 has taken $29.4M in lifetime volume. That is more than the national Senate control board, which is the single most revealing number on the whole midterm map: traders have committed more money to one Texas seat than to who runs the chamber.

Democrat James Talarico sits at 64c on Kalshi and 63c on Polymarket against Republican Ken Paxton at 37c and 36c. A YouGov survey of 3,625 registered Texas voters fielded September 28 to October 5, 2026 put Talarico ahead 50% to 44%, with 3% undecided and a 3-point margin of error. A six-point lead with that little undecided support is roughly what a 63.5c price should look like, so the board is not out over its skis here. The Republican leg still drew $599.8K of the last 24 hours against $239.3K on Talarico's, which is the market's way of saying the doubt is real but cheap. Texas early voting opens October 19.

The Six 2026 Midterms Senate Seats Still Priced Under 70

These are the only two-book Senate boards where the favorite is priced below 70c, which is the working definition of a race the market still considers contested.

The forecaster consensus on 270toWin currently rates twelve Senate races competitive. The boards price six races inside that band. North Carolina, Georgia, New Hampshire, Minnesota and South Carolina are all still on the forecasters' competitive list and all trade at 85c or higher. That is the sharpest divergence on the board right now, and it is a testable one: if the ratings are right, several of those prices are badly mispriced, and if the boards are right, five of the twelve races were decided weeks ago.

Michigan Carries the Widest 2026 Midterms Cross-Platform Spread

Michigan prices Democrats at 68c on Kalshi and 71c on Polymarket. A 3c gap on an $8.1M board is the widest cross-platform disagreement on any two-book Senate race. Texas, Kansas, Iowa and Maine sit inside 1c, and Ohio inside 2c.

Michigan also happens to be the only Democratic-held seat the board gives real downside, with Republicans at 33c and 30c. That combination is why it is the race to watch rather than the race to trade: a Michigan loss does not just cost a seat, it forces a fifth pickup, and the board's four-seat chain has no fifth leg priced above Kansas at 38.5c. Buy the Polymarket side or the Kalshi side depending on which direction of that 3c you believe, but the spread itself is the signal that the question is open.

2026 Midterms Seats the Boards Treat as Over

Roy Cooper is 96c on both venues in North Carolina and Jon Ossoff is 95c and 96c in Georgia. Louisiana Republicans sit at 94c and 93c, Tennessee at 93c and 94c, Florida at 91c on both, South Carolina at 86c and 85c, and New Hampshire Democrats at 90c and 89c. Seven seats, all above 85c, all effectively filed away.

Minnesota needs a caveat. The Republican leg is a clean two-book quote at 14c and 13c, but the Democratic leg prices only on Polymarket at 88c. That is a single-venue quote, not a cross-platform consensus, and the missing Kalshi leg is an absence of a quote rather than a zero.

Governor Boards Are the Thin Side of the 2026 Midterms

The governor races carry the most money and the least doubt. CA Governor Race 2026 is the largest politics board on the site at $97.7M, and Xavier Becerra is 96c on both venues. Nothing about it is competitive.

The contested governor boards are small. Georgia prices Republicans at 57c on Kalshi and 54c on Polymarket, a 3c spread on $1.5M. Ohio has Democrats at 69c on both venues against Vivek Ramaswamy at 32c and 31c. Wisconsin Democrats are 81c, Iowa Democrats 88c. Nevada is the closest board of the set at 52c Democratic, and it quotes on Kalshi only, which means it is one venue's opinion rather than a consensus.

When the 2026 Midterms Control Markets Resolve

Election day is November 3, 2026, but neither control board resolves that night. Both the House and Senate control markets carry a February 1, 2027 resolution date, which puts recounts, runoffs and independent caucus decisions inside the contract window rather than outside it. Maine, Ohio and Alaska resolve January 4, 2027. Iowa resolves on election day itself.

The 2026 Balance of Power board runs longest, with an April 3, 2027 backstop. It prices a Democratic sweep of both chambers at 61c and 62c, a Democratic House with a Republican Senate at 30c and 28c, a Republican sweep at 11c and 10c, and a Republican House with a Democratic Senate at 0.8c and 1c. Add the two Democratic-House legs and you get 90.5c, matching the standalone House board almost exactly. The combined board and the chamber boards agree, so there is no structural trade between them.

Key 2026 Midterms Catalysts Before November 3

Texas early voting: Opens October 19, the first hard turnout data on the biggest board of the cycle.

Michigan's 3c spread: A convergence tells you which venue blinked on the only Democratic-held seat with real downside.

Kansas and Iowa: The substitute pickups at 38.5c and 42.5c that keep the Senate chain alive if Texas, Ohio, Maine or Alaska breaks.

The forecaster gap: Any move in North Carolina, Georgia or Minnesota off 85c would mean the ratings were right and the boards were early.

Runoff exposure: Seats decided after November count toward the control boards, which is why those contracts run to February and April 2027.

Other 2026 Midterms Boards on the Same Ballot

The full ballot is wider than the two chambers. The 2026 U.S. House Control odds and the 2026 Balance of Power board frame the national question, Texas Senate Winning Party 2026 and the Maine Senate 2026 board hold the two biggest state contests, and the rest of the cycle's boards sit under politics. Watch Michigan and Texas. Everything else on this map is already priced.