US Midterms 2026 Odds: Who Will Win the House and Senate?

Quick answer: On 30 October 2026, Chipstars Predictions priced a Democratic sweep of Congress at about 68.5%, a Democratic House at about 93.5% and a Democratic Senate at about 68.5%. Americans vote on Tuesday 3 November 2026 for all 435 House seats and 35 of the 100 Senate seats. Republicans hold both chambers today.

Updated: 30 October 2026

• Election day: Tuesday 3 November 2026
• Seats up: All 435 House seats, 35 of 100 Senate seats
• Senate today: 53 Republicans, 45 Democrats, 2 independents who caucus with the Democrats
• House majority: 218 seats
• Balance of Power on Chipstars Predictions: Democrats sweep about 68.5%, Republican Senate with Democratic House about 24.5%, Republicans sweep about 6.5%

What is on the ballot in the 2026 midterms?

The 2026 midterms decide who controls the US Congress for the second half of President Donald Trump's term. Republicans go in with a narrow House majority, and some states redrew their maps: Texas added five Republican-leaning districts, and California voters approved Proposition 50, a map aimed at five Republican-held seats.

In the Senate, the Democratic Party needs a net gain of four seats, because a 50 to 50 Senate is decided by Vice President JD Vance.

What do the midterm odds say on Chipstars Predictions?

Prices on Chipstars Predictions on 30 October 2026:

• Balance of Power: Democrats sweep: about 68.5%
• Balance of Power: Republican Senate, Democratic House: about 24.5%
• Balance of Power: Republicans sweep: about 6.5%
• House 2026: Democratic Party: about 93.5%
• Senate 2026: Democratic Party: about 68.5%
• Senate 2026: Republican Party: about 31.5%

The market treats the House as the clearer race and the Senate as the real contest. A Democratic Senate with a Republican House was priced under 1%.

Which Senate races could decide control?

Chipstars Predictions also lists five Senate races. In the polling averages Newsweek reported on 23 October 2026, all five were within about four points.

• Texas: James Talarico (D) vs Ken Paxton (R), open seat: Talarico about 71.5%, Paxton about 28.5%
• Ohio: Sherrod Brown (D) vs Senator Jon Husted (R), special election: Brown about 70.5%, Husted about 29%
• Maine: Troy Jackson (D) vs Senator Susan Collins (R): Jackson about 66.5%, Collins about 34%
• Michigan: Abdul El-Sayed (D) vs Mike Rogers (R), open seat: El-Sayed about 77%, Rogers about 22.5%
• Alaska: Mary Peltola (D) vs Senator Dan Sullivan (R): Peltola about 69.5%, Sullivan about 30.5%

The latest Texas polls reported by Forbes on 29 October 2026 still lean to Talarico: 49% to 43% in a CNN survey and 49% to 47% in a Texas Southern University/YouGov poll.

How do the markets compare with forecasts?

Forecast models disagree on the Senate. In the figures Newsweek collected on 23 October 2026, Silver Bulletin gave the Democrats a 76.4% chance, VoteHub 60% and Decision Desk HQ 57%, so the market's 68.5% sits inside that range. For the House, Silver Bulletin gave 95%. None of this is a result: an answer priced at about 35% still comes true roughly one time in three.

How do the percentages work?

Each percentage on Chipstars Predictions matches the market price and moves with news, polls and, on election night, the first results. A correct Yes pays more the lower the percentage you bought at: as a simple illustration, a Yes at about 25% returns roughly four times the stake, a Yes at about 75% roughly one and a third times. Your bet keeps the price you took. Markets settle once a result is clear, which in close races can take days. More in our guide on how prediction markets work.

Can I bet on the US midterms from outside the USA?

Yes, where Chipstars accepts players. Chipstars does not accept players who live in or are located in the USA, so these markets are for readers following the vote from abroad. Open Chipstars Predictions, choose Politics, pick a market and an answer, and enter a stake. Sports bets are in the Chipstars sportsbook.

FAQ

When are the 2026 US midterm elections?

Tuesday 3 November 2026. Polls close in the evening US time, which is the night of 3 to 4 November in Europe.

Who is favoured to win the Senate in 2026?

On 30 October 2026, Chipstars Predictions priced the Democratic Party at about 68.5% and the Republican Party at about 31.5% to control the Senate.

What does "Democrats sweep" mean?

It means the Democratic Party wins control of both the House and the Senate. It was priced at about 68.5% on 30 October 2026.

What happens if the Senate ends 50 to 50?

The vice president casts tie-breaking votes, so a 50 to 50 Senate stays under Republican control while JD Vance holds that office.

Sources

• Wikipedia: 2026 United States Senate elections
• Wikipedia: 2026 United States House of Representatives elections
• Newsweek: What polls show 10 days out (23 October 2026)
• Forbes: latest polls in the 2026 midterms (29 October 2026)
• Chipstars Predictions, market prices on 30 October 2026

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