Democrats are favored by offshore oddsmakers to win both the House and the Senate, according to the latest 2026 midterm election odds reported by USA TODAY. With less than a month left before Election Day, the betting lines have moved sharply toward a Democratic House and a Democratic Senate. Still, odds are not forecasts, and polls and political analysts describe the Senate as far closer than the betting numbers suggest.
Offshore sportsbooks list a Democratic sweep of Congress as the favorite. The House looks like the safer Democratic bet, while the Senate remains tight. The Cook Political Report calls the fight for the Senate a true toss-up, and national polls show Democrats ahead on the generic ballot by about nine points.
Key facts at a glance
| Detail | What is reported |
|---|---|
| Election Day | Nov. 3, 2026 |
| House | All 435 seats are on the ballot |
| Current Senate split | Republicans hold a 53-47 majority |
| Democratic sweep (William Hill) | -250 |
| Democratic sweep (Bovada) | -150 |
| Democratic sweep (BetOnline) | -210 |
| Generic ballot (Silver Bulletin) | Democrats up 9.0 points as of Oct. 2 |
| Senate rating (Cook Political Report) | True toss-up; Democrats need a net gain of four seats |
What the 2026 midterm election odds show for Congress
Lee Phelps, a spokesperson for the bookmaker William Hill, told USA TODAY that Democrats are more heavily favored to win the House than at any comparable point in a midterm cycle. He said bettors are “in no doubt” about the outcome there.
The Senate has moved even more. According to Phelps, Democrats opened at 5/2 odds, which equals roughly a 28% chance of winning the chamber. Those odds have since shortened to 4/9, an implied probability of about 69%.
Betting volume tells a more cautious story. Phelps said only 32% of Senate bets at William Hill favored Democrats, because many customers backed Republicans earlier at short prices, between 1/3 and 8/13. Those wagers now look weaker after the market reversed.
USA TODAY tied Democratic strength in Senate contests in Texas, Iowa and Kansas to the U.S. war on Iran and a recent spike in diesel prices. Before those developments, the three states appeared unlikely to be competitive.
Sportsbook lines side by side
The 2026 midterm election odds from these books use American format, which follows a simple rule. A negative number, such as -250, marks the favorite, while a positive number, such as +900, marks the underdog. USA TODAY listed four combined outcomes at three offshore books.
- William Hill: Democrats win both chambers -250; Democratic House with Republican Senate +175; Republicans win both +900; Republican House with Democratic Senate +6600.
- Bovada: Democrats win both -150; Democratic House with Republican Senate +175; Republicans win both +600; Republican House with Democratic Senate +1800.
- BetOnline: Democrats win both -210; Democratic House with Republican Senate +185; Republicans win both +1000; Republican House with Democratic Senate +6500.
All three books treat a split Congress with a Democratic House and a Republican Senate as the main alternative. A Republican House paired with a Democratic Senate is priced as by far the least likely result. USA TODAY noted that U.S. bookmakers cannot legally offer these markets.
Why the Senate looks tighter than the House
The Cook Political Report, a nonpartisan election analysis publication, wrote on Sept. 23 that Senate control had become a true coin flip. Its analysts see Democrats netting between one and five seats, and they need four to win a majority.
Even with favorable 2026 midterm election odds, the report pointed to obstacles for Democrats. Several of the seats they must win lean strongly Republican, and Republicans hold a sizable financial advantage. Republicans currently hold a 53-47 Senate majority after flipping four seats in 2024, Forbes reported.
Recent polls in key Senate races
Forbes compiled the latest public surveys. The margins are small in most places:
- Texas: Democrat James Talarico 51%, Republican Ken Paxton 45% (New York Times/Siena).
- Ohio: Democrat Sherrod Brown 49%, Republican Jon Husted 46% (New York Times/Siena).
- Iowa: Republican Ashley Hinson 48%, Democrat Josh Turek 47% (New York Times/Siena).
- Kansas: Republican Roger Marshall 47%, Democrat Adam Hamilton 46% (New York Times/Siena).
- Maine: Republican Susan Collins and Democrat Troy Jackson tied at 50% each (CBS News/YouGov).
- Michigan: Democrat Abdul El-Sayed 50%, Republican Mike Rogers 49% (Fox News).
Many of those gaps fall inside normal polling error, which fits the Cook assessment that the key races sit within the margin of error.
What national polls say about the House
Polling points the same direction as the 2026 midterm election odds on the House. The generic ballot asks voters which party they plan to support for Congress. The Silver Bulletin average showed Democrats leading by 9.0 points on Oct. 2, up from 6.7 points at the start of September. The site said that was a high point for the party this cycle.
A New York Times/Siena poll released Sept. 15 found 51% of respondents planned to back the Democratic candidate in their district, compared with 43% for the Republican. Forbes also reported that President Donald Trump’s approval rating stood at 37% in the Silver Bulletin average. It noted that the president’s party has historically struggled in midterm elections.
Why odds are not predictions
The 2026 midterm election odds reflect what bettors are willing to pay, which can lag behind new information. The William Hill example shows it: customers who backed Republicans early now hold positions that look weaker, and the book’s own Senate volume still leans Republican.
Votes, not odds, decide control of Congress. Readers who want a fuller picture can compare the betting lines with nonpartisan ratings and polling averages, and check for updates as new surveys arrive before Nov. 3.
Frequently asked questions
Who do oddsmakers favor to win the House and Senate?
The 2026 midterm election odds cited by USA TODAY favor Democrats to win both chambers, with the House viewed as the stronger Democratic opportunity.
What are William Hill’s odds for a Democratic sweep?
William Hill lists Democrats winning both chambers at -250. A Republican sweep is listed at +900.
Why do only 32% of William Hill Senate bets favor Democrats?
Spokesperson Lee Phelps said the book took many bets on Republicans earlier, when they were favored to win the Senate, and that volume still weighs heavily toward Republicans.
How close is the Senate race, according to analysts?
The Cook Political Report called Senate control a true coin flip on Sept. 23. It sees Democrats gaining between one and five seats and needing four for a majority.
What do national polls say about the House?
The Silver Bulletin generic ballot average had Democrats ahead by 9.0 points on Oct. 2, and a Sept. 15 New York Times/Siena poll showed Democrats at 51% to Republicans’ 43%.
