Millions of Americans are voting in midterm elections that will determine which political party controls the House of Representatives and the Senate. The outcome decides whether US president Donald Trump’s Republicans or opposition Democrats command Congress.
However, declaring the final balance of power in Washington may take several hours, days, or even weeks depending on narrow margins and state counting procedures.
Congressional control, seat thresholds
Congress consists of two chambers – the House of Representatives and the Senate. In the House, a political party requires 218 seats to secure a governing majority.
In the 100-member Senate, an outright majority demands 51 seats, though a 50-50 division allows the vice-president to exercise a tie-breaking vote to grant their party control.
Initial voting returns arrive after 18:00 EST (23:00 GMT) from safe strongholds such as Kentucky and Indiana for Republicans, and Vermont for Democrats.
Throughout election night, analysts observe competitive contests in the Eastern Time zone to gauge political momentum. Key Senate battlegrounds like Ohio, closing at 19:30 EST (00:30 GMT), and Maine, closing at 20:00 EST (01:00 GMT), provide early indications of voter sentiment.
Media organisations deploy analytical models to project state outcomes before full counts finish, calling races when a candidate establishes an unassailable lead. When margins remain close, networks refrain from declaring winners.
Key 2026 battlegrounds
Determining victory often extends beyond election night. During the 2022 midterms, control remained undecided on 9 November, a day after voting concluded. CBS News projected a Republican House majority on 17 November after the party reached 218 seats.
In Nevada, a crucial Senate tabulation lasted four days before Democrats won their 50th seat, retaining chamber control via the tie-breaking vote of Kamala Harris, then vice-president. Georgia’s Senate race required a December run-off election after no candidate secured 50 per cent of the vote, culminating in a Democratic victory on 7 December.
Attention in 2026 focuses on seven Senate toss-up seats identified by Cook Political Report, an independent elections analyst: Alaska, Kansas, Iowa, Maine, Michigan, Ohio, and Texas. Six seats are held by Republicans and one by Democrats.
To reach a 51-seat majority, Democrats must capture four toss-up seats alongside four contests classed as leaning or likely Democratic.
In Michigan, Abdul El-Sayed, a left-wing political outsider, opposes Mike Rogers, a Republican candidate, former FBI agent, and Trump ally.
In Texas, James Talarico, a former teacher and Democrat contender, challenges Ken Paxton, state attorney general and close Trump ally, aiming to become the first Texas Democrat senator since 1988.
Republicans hold a thin House majority with 218 representatives plus one voting independent. Key House contests include New York’s 17th District, Pennsylvania’s 8th District, and Virginia’s 1st District.
Polling closure schedule across key battlegrounds
An initial voter poll released at 17:00 EST (22:00 GMT) will highlight primary voter concerns before polls close in Kentucky and Indiana at 18:00 EST (23:00 GMT). At 19:30 EST (00:30 GMT), voting finishes in Ohio, where Jon Husted, Republican senator, faces Sherrod Brown, Democrat candidate.
At 20:00 EST (01:00 GMT), polling closes in Maine between Susan Collins, Republican senator, and Troy Jackson, Democrat contender, alongside most of Michigan, Kansas, and Texas.
At 21:00 EST (02:00 GMT), polls close in Iowa – where Ashley Hinson, former local news reporter, competes against Josh Turek, former basketball player- as well as central time zone regions of Michigan, Kansas, and Texas.
Voting concludes at 01:00 EST (06:00 GMT) in Alaska, where Mary Peltola, Democrat candidate, challenges Dan Sullivan, incumbent Republican senator, in a contest featuring a second candidate named Dan Sullivan.
How ballots are counted and certified
The vote-counting mechanism varies because each state administers elections independently. Florida processes early and mail ballots prior to election day, whereas other states begin tabulating on 3 November.
Local election officials verify and count ballots during canvassing, with post-election audits comparing manual counts against machine totals.
Delays stem from tight margins, signature verification on mail-in envelopes, and potential legal challenges. Over 30 states permit ballot processing before election day, but California accepts mail ballots postmarked by election day if received within seven days.
In Alaska, ranked-choice voting and ballot controversies can prolong calculations. Once counting finishes, local and state certifications occur before governors sign documentation sent to Congress.
Candidates can request recounts or file election contests alleging irregularities. Congress holds final authority regarding seating, with outgoing members leaving office on Sunday 3 January when new members take office.