Event hub

2026 Midterm Elections Odds

The 2026 US midterm elections are scheduled for November 3, 2026, and they will decide which party controls each chamber of the 120th Congress. Voters will fill all 435 seats in the House of Representatives, roughly a third of the Senate, and most of the country's governorships on the same day. Prediction markets such as Polymarket and Kalshi run continuous "control of the House" and "control of the Senate" contracts whose prices read as a money-weighted estimate of each party's chances. This page explains what is actually on the ballot, how those control markets are framed and how they resolve, what moves the odds between now and Election Day, and the dates worth watching. Throughout, treat market prices as crowd-implied probabilities that can be wrong; nothing here is financial advice.

No live markets on this are trading right now — browse the live feed for what the crowd is pricing today.

What is on the ballot in 2026

Every seat in the House of Representatives is up in a midterm year, so all 435 districts are contested on November 3, 2026. A party needs 218 seats for a majority. Heading into the election, Republicans hold a narrow House majority of roughly 218 seats to Democrats' 212, which is one of the slimmest margins in modern history and a large part of why control is treated as genuinely uncertain.

The Senate works differently. Only one of its three classes faces voters in any cycle, and in 2026 that is Class 2. Counting two special elections, the map has Republicans defending about 22 of the contested seats and Democrats defending 13. Going in, Republicans hold 53 seats to the 47 that Democrats and the two independents who caucus with them control. A simple majority is 51 seats, so a tie at 50-50 is broken by the vice president, whose party currently holds the White House. Because Democrats are defending fewer seats but must flip a net of four Republican-held seats to reach 51 (Republicans can lose only two and keep their majority), analysts have generally described the 2026 Senate map as harder terrain for them than the House.

Two of the Senate contests are special elections to fill seats vacated mid-term: one in Ohio, after JD Vance resigned to become vice president, and one in Florida, after Marco Rubio left to become secretary of state. The winners serve out the remainder of those terms. Beyond Congress, 36 states elect governors in 2026, along with many state legislatures, attorneys general, and local offices, which is why the cycle reaches well past control of Washington.

How prediction markets frame control of Congress

The headline markets are straightforward yes/no questions: which party will control the House, and which party will control the Senate, when the new Congress is seated. On Polymarket and Kalshi these trade as shares priced between roughly 1 cent and 99 cents. A price reads directly as an implied probability, so a 'Democratic House' share trading at 60 cents corresponds to a market-implied 60 percent chance. The two chambers are priced separately, and some venues also list a combined 'balance of power' market covering the four possible House-plus-Senate outcomes at once.

These prices are a money-weighted aggregate of what traders collectively expect, updated continuously as new polling, candidate news, and results arrive. That is their value as a news signal: they compress a flood of forecasts and reporting into a single number that moves in real time. It is also their limit. A market price is not a forecast from any single model or expert, it reflects the views and risk appetite of whoever is trading, and it can be moved by thin volume or by sentiment that later proves wrong. Markets misprice events, sometimes badly, so the honest way to read a control price is as one probability estimate among several, not as a settled outcome.

Crowdtells treats these markets as a read on what is worth covering rather than as something to trade. When a control price swings, it usually means real news moved underneath it, and that news is the story.

How the markets resolve

A control market only pays out once the result is settled by an agreed-upon source, which is what keeps the contract objective. For the 2026 congressional markets, resolution has typically been tied to multiple major election callers, with venues citing decision desks such as the Associated Press, Fox News, and NBC News, and resolving once those sources have conclusively called the chamber.

The definition of 'control' is written into each market's rules. For the House, a party controls the chamber if it wins a majority of the voting seats, meaning 218 or more. For the Senate, control generally means holding more than half of the voting members, or holding exactly half with the vice president of that party able to break ties. Because the Senate can sit at 50-50, the rules account for the vice-presidential tiebreak so the contract still has a clear winner. To pin down edge cases, Kalshi has framed Senate resolution around the party of the president pro tempore of the Senate as of a set date in early 2027, after the new Congress is seated, rather than on election night alone.

That distinction matters because close races can take days to call, recounts and runoffs can delay an official result, and a seat can change hands between the vote and the seating of Congress. Always read the specific market's resolution text. Two contracts on the same question can settle on slightly different criteria or dates, and that fine print is exactly what determines who is right.

What moves the odds

The single most-watched input is the generic congressional ballot, the polling question asking which party's candidate voters would support for Congress. A widening or narrowing lead there tends to move House control prices quickly, because a national swing maps roughly onto seats. As of mid-June 2026, generic-ballot averages showed Democrats ahead by several points, which is consistent with the House being treated as competitive rather than safe for either side.

Presidential approval is the other broad driver. Midterms are widely read as a referendum on the party that holds the White House, and history sets a strong prior: since 1934 the president's party has lost House seats in almost every midterm, by an average of roughly 28 seats. The clearest exceptions came in 1998, when a strong economy and backlash to impeachment helped the president's party, and in 2002, when post-September 11 approval lifted it. Markets read low presidential approval as a tailwind for the out-party, and they move when approval shifts.

Narrower factors move individual races and, through them, the chamber totals. Candidate quality, primary results, retirements that open competitive seats, fundraising, and scandal all feed in. Redistricting has been an unusually large factor this cycle: a mid-decade round of map changes, led by a Republican-drawn Texas map and a Democratic-drawn California response, shifted the partisan lean of several districts before a single 2026 vote was cast, and court rulings on those maps moved the baseline. As actual results report on election night, the markets converge toward certainty, with prices snapping to near 0 or near 100 as chambers are called.

Key dates to watch

The fixed anchor is Election Day, Tuesday, November 3, 2026, when House, Senate, and gubernatorial races are decided. In practice the calendar that moves odds is longer. Primary season runs through the spring and summer of 2026, and each primary resolves who the nominees are, which is when 'candidate quality' stops being a guess. Filing deadlines and any court decisions on contested district maps also land earlier in the year and reset the baseline for affected seats.

In the final stretch, the steady drip of generic-ballot polling and presidential-approval readings drives most of the day-to-day movement in control prices. Early and mail voting begins weeks before Election Day in many states, and the share and partisan lean of returned ballots becomes a real-time input. On election night and the days after, markets move as decision desks call individual races and, eventually, each chamber.

Resolution can lag the vote. Close contests, automatic recounts, and any required runoffs can push a final call past November, which is why control markets sometimes stay open after Election Day. The new Congress is seated in January 2027, and any market that resolves on the seated majority settles around then. As with every figure here, dates and standings can change, so check current sources before relying on any specific number, and remember that none of this is financial advice.