Polymarket and Kalshi Traders Bet $70M+ on 2026 US Midterm Elections

Polymarket traders price Democrats at 86% odds to win House control in the 2026 US midterm elections, with $9 million traded on that market. Republicans hold a 56% probability for Senate control on Polymarket's $3 million market, while Kalshi's Kentucky 4th District GOP primary between Ed Gallrein and Thomas Massie leads all midterm markets at $22 million in trading volume. The betting activity reflects competitive dynamics across dozens of Senate, House, and gubernatorial contests, with prediction markets requiring participants to back political forecasts with capital rather than poll responses. Nevada's abortion protection amendment commands the strongest odds among ballot measures at 92%, while California's proposed one-time wealth tax on billionaires trades at 34% on $4 million in volume.

Polymarket Projects Democratic House Advantage and Republican Senate Edge

Polymarket's current seat projection points to 232 Democratic seats against 203 for Republicans in the House. The Senate outlook favors Republicans at 56%, with traders projecting a 49 to 51 seat split in the GOP's favor. That Senate market has drawn $3 million in volume.

Ballot Measures Draw Millions in Trading Volume

California's proposed one-time wealth tax on billionaires sits at 34% odds to pass, with $4 million traded. Michigan's push to rewrite its state constitution is priced at 19% odds on $6,400 in volume. In Missouri, a ban on abortion and gender transition care for minors is trading at 18% odds to pass. Nevada's abortion protection amendment carries 92% odds among ballot measures.

Senate Battlegrounds Lead Polymarket Activity

Maine leads Polymarket's Senate trading at $1 million in volume, with Democrats favored at 68%. Alaska's governor race, also at $1 million in volume, gives Republicans a 58% edge. Tom Begich leads that crowded contest at 35%, followed by Bernadette Wilson at 30% and Jonathan Kreiss-Tomkins at 16%.

Texas and Alaska Senate seats are drawing close bets. Ken Paxton holds a 56% edge over James Talarico in the Texas matchup, a race Polymarket prices as a 50-50 toss-up at the party level on $611,000 in volume. In Alaska, Democrat Mary Peltola leads Republican Dan Sullivan 60% to 42%, with the seat rated lean Democrat on $367,000 traded.

State-by-State Senate Map Shows Safe Seats and Competitive Races

Polymarket has built out a full state-by-state Senate map covering 24 individual races. Republicans are treated as near locks in Nebraska, Montana, Tennessee, and Mississippi, each trading above 90%. Democrats hold similarly safe positions in Colorado, Minnesota, New Jersey, and New Mexico, all above 94%. Toss-up markets have formed in Ohio, Illinois, and Kentucky, each trading at 50% with lighter volume than the headline races.

Iowa leans Republican at 62%, while Michigan and North Carolina lean Democrat at 68% and 87% respectively, with North Carolina's market built around Roy Cooper's bid against Michael Whatley. South Carolina and Kansas both lean Republican in the 83% range. Florida, Idaho, Oklahoma, and Louisiana sit above 86% for the GOP with trading volume under $60,000 apiece.

Governor and House Primary Markets Round Out Polymarket Slate

Xavier Becerra is favored at 93% over Steve Hilton in California's gubernatorial race. New York and Maine both show Democrats above 90%, while Arizona's Democratic candidate holds a 78% edge. Wisconsin and Georgia sit closer to even, with Democrats favored at 57% and 56%, respectively. Vermont is the lone Republican leaning governor's race among the states listed, with the GOP favored at 83%. South Dakota and New Hampshire also lean Republican at 93% and 79%.

Polymarket traders are active in dozens of individual congressional primaries. On the Democratic side, Minnesota Representative Ilhan Omar holds a 98% edge in her primary, while Missouri Representative Cori Bush is favored at 54% over Wesley Bell. In Michigan's 13th District, Donavan McKinney leads Shri Thanedar at 75%.

On the Republican side, Florida's 6th District primary between Randy Fine and Dan Bilzerian favors Fine at 96%, and Alabama Representative Jerry Carl is priced at 99% to turn back a primary challenge. Florida's 2nd District primary remains the most contested Republican matchup tracked, with Keith Gross narrowly favored over Evan Power at 50% to 33%.

Kalshi Primary Markets Attract Higher Trading Volumes

Kalshi's midterm activity centers on primary contests, and the volume dwarfs Polymarket's totals. The Kentucky 4th District Republican primary between Ed Gallrein and Thomas Massie had drawn nearly $22 million. The Texas Republican Senate primary between Ken Paxton and John Cornyn has pulled in $18.4 million, while the Texas Democratic Senate primary pitting James Talarico against Jasmine Crockett has traded $14.6 million.

California's gubernatorial primary between Becerra and Hilton has drawn nearly $11 million on Kalshi, and Florida's Republican governor primary between Byron Donalds and James Fishback has pulled in $10.3 million, with Donalds favored at 96%. The Los Angeles mayoral matchup between Nithya Raman and Karen Bass has traded $9.9 million. Maine's Democratic Senate primary, where Graham Platner is favored over Janet Mills, has drawn $6.2 million.

House and Gubernatorial Primary Activity on Kalshi

Colorado's 1st District Democratic primary between Melat Kiros and Diana DeGette leads House-level trading at $1.5 million, followed by New York's 12th District contest between Micah Lasher and Alex Bores at $1.3 million and New York's 13th District race between Darializa Avila Chevalier and Adriano Espaillat at $1.2 million.

Illinois' 9th District primary pitting Daniel Biss against Kat Abughazaleh has drawn $1.1 million, while Texas Representative Colin Allred's primary against Julie Johnson in the 33rd District has traded $844,000. Michigan's Democratic Senate primary between Abdul El-Sayed and Haley Stevens has drawn nearly $3 million, with El-Sayed favored at 79%. Illinois' Democratic Senate primary between Juliana Stratton and Raja Krishnamoorthi has traded $1.5 million.

Wisconsin's Democratic gubernatorial primary between Francesca Hong and David Crowley has drawn $1.9 million, with Hong favored at 77%. Colorado's Republican primary between Victor Marx and Barbara Kirkmeyer has traded $1.4 million. South Dakota's Republican primary between incumbent Larry Rhoden and Toby Doeden has pulled in $1.3 million, with Rhoden favored at 94%. Oklahoma's Republican primary between Mike Mazzei and Gentner Drummond has drawn over $900,000, alongside a similarly sized market in Maine's Democratic primary between Hannah Pingree and Nirav Shah.

Traders Bet on Primary Season Structural Outcomes

A Kalshi market asking how many House Democrats will lose their primary shows 82% odds that seven or more incumbents fall, on $93,655 traded. A parallel market on House Republican losses shows 45% odds for four seats lost. A separate market tracking whether progressive Democrats sweep contested Senate primaries sits at 54% odds to complete the sweep.

Southern Senate and governor primaries in Texas, Kentucky, California and Florida account for more than $70 million of Kalshi's total volume, according to the platform's own market data. The volume concentrated in races like Kentucky's 4th District and the Texas Senate contests signals where political operatives and bettors expect the closest fights.

FAQ

What are the current odds for Democratic control of the House in 2026? Polymarket traders price Democrats at 86% odds to win House control in the 2026 midterm elections, with $9 million traded on that market. The platform's current seat projection points to 232 Democratic seats against 203 for Republicans.

Which prediction market contest has the highest trading volume for the 2026 midterms? Kalshi's Kentucky 4th District Republican primary between Ed Gallrein and Thomas Massie leads all midterm markets at $22 million in trading volume. The Texas Republican Senate primary between Ken Paxton and John Cornyn follows with $18.4 million traded.

What are the odds for Nevada's abortion protection amendment? Nevada's abortion protection amendment carries 92% odds of passage on prediction markets, the strongest favorite among all ballot measures being tracked for the 2026 cycle.