The House is fair value. Silver Bulletin's aggregate had the generic ballot at Democrats +6.7 on August 11, with Trump's net approval at –20.4 against a second-term low of –20.6 on July 30, and the House contracts price what that polling environment implies. Polymarket's Balance of Power legs normalize to a Democratic House near 86%, Kalshi's to 85%. Fair is 88%.
The Senate is the whole story now. Polymarket's Senate control contract has Democrats at 51%. Its seat ladder, on $2.85 million, implies 49-53 once the count is adjusted for Nebraska, where a win by Independent Dan Osborn lowers the Republican seat number without handing Democrats control of the chamber. Silver Bulletin's FLIPR model, launched August 11, says 57.3%. Fair is 45%.
We're tracking every election through the 2026 midterms right here as the political scene ramps up toward the 2028 Presidential Race. Here's the latest movement in polls and the live markets at Kalshi and Polymarket.
Democrats Favored in U.S. House Midterm Election Markets
The case for 45% is mathematical. Democrats need a net gain of four seats across 35 contests. Hold Michigan and Georgia, take Maine and North Carolina, and they are still two short, with every remaining pickup running through Ohio, Iowa, Texas or Alaska, states Trump carried by 11 points or more in 2024.
Republicans have to win three of those four. FLIPR rates Texas as Lean Democratic, which is where most of the 12-point gap comes from, and Kalshi still prices that race at even. Against that, Cook Political Report's ratings have moved net toward Democrats in every update this year.
Trade: Democratic Senate Control
BUY NO at 50 cents against a fair value of 55%. Five points on $3.98 million, the deepest contract that takes the view directly, and five points is the threshold itself rather than clearance through it. Kalshi's four-way board implies the same leg at 47.2, so the fill is better on Polymarket.
The position is a bet on the Texas Senate race. The 45% requires Republicans to keep the seat. Kalshi prices that race at 50-50 on $9.2 million and offers no view; FLIPR says 60% Talarico, up a point after Cook moved Texas from Lean R to Toss-up; the Silver Bulletin average has Talarico ahead 47.4 to 45.6, with Emerson at Paxton +1 on August 9-10 against Siena at Talarico +4 two weeks earlier. Cook moved Iowa the same day. The fair value map argument needed three of four toss-ups to stay Republican, and the raters have made two of them look easier. Half size. Talarico winning takes the Senate leg near 65, and the position dies.
Trade: Democratic Sweep of Both Chambers
Fair value at 48 cents (Kalshi), 49 cents (Polymarket). The sweep pays only if both chambers flip, so it is worth the Senate probability multiplied by the odds of a Democratic House win. The board gives that second number away. A Republican House with a Democratic Senate trades at 1.3 cents on Kalshi and 1.1 on Polymarket (both fair), which is the market saying a Democratic Senate rarely arrives without a Democratic House. Normalized, the conditional is 97.5%.
Run the 45% fair value, and the sweep is worth 44%, 4-5 points under the price and at or inside the threshold. Run the market's 51%, and it comes to 50%, which puts a fade on the wrong side of the math.
