2026 midterm elections: control of Congress, the generic ballot, and when results become official

A midterm election is the federal election held halfway through a four-year presidential term. Every one of the 435 seats in the U.S. House of Representatives is contested, roughly one third of the 100 seats in the U.S. Senate are up for election, and most states choose a governor and state legislature on the same ballot. The presidency itself is not on the ballot.

Midterm outcomes depend on how single-member district maps and staggered Senate terms interact across all 50 states. House majorities require 218 seats across 435 individual district races, while Senate majorities require 51 seats (or 50 with the Vice President's tie-breaking vote) drawn from the 33 Class II seats up for election alongside any mid-term special elections.

How is control of the House and Senate decided in a midterm?

Control of each chamber goes to the political party holding a majority of its seats: 218 of 435 in the House, and 51 of 100 in the Senate (or 50 seats plus the Vice President's tie-breaking vote). All 435 House seats are contested every two years. The Senate is divided into three staggered classes, and the class on the ballot in 2026 is Class II, whose terms expire at the end of the 119th Congress under the Class II roster. That puts 33 regular Class II seats on the ballot, alongside any special elections required for seats vacated mid-term.

Party majorities include independent members who officially caucus with a party. Consequently, an independent senator can determine control of the chamber without being listed as a member of either major political party.

If leadership of a chamber remains ambiguous during initial vote counts, formal control resolves when the newly elected body convenes: the House elects its Speaker, and the Senate selects its President pro tempore.

When are the 2026 midterms, and when do results become official?

The 2026 midterm elections take place on Tuesday, November 3, 2026. Under 2 U.S.C. 7, federal law mandates that congressional elections occur on the Tuesday next after the first Monday in November in every even-numbered year. The newly elected 120th Congress formally assembles at noon on January 3, 2027, as required by Section 2 of the Twentieth Amendment, unless Congress establishes a different date by law.

State authorities and local election boards certify vote tallies in the weeks following election day. Where close contests trigger recounts or post-election runoffs, final certifications extend through December.

The new Congress takes office on January 3, 2027, and official national election statistical summaries are subsequently published by the Clerk of the House.

How often does the president's party lose seats in a midterm?

The president's party historically loses House seats in midterm elections, holding true in six of the eight midterms between 1994 and 2022 according to the Party Divisions of the House of Representatives historical records. The two modern exceptions occurred in 1998, when Bill Clinton's Democrats gained four seats, and in 2002, when George W. Bush's Republicans gained eight seats. In the remaining six midterms during that span, House seat losses for the president's party ranged from 9 to 64 seats.

The Senate record exhibits greater variability because only one third of the chamber is up for election in any given cycle. According to the Senate Party Division record, the president's party lost Senate seats in four of those eight midterms, gained seats in two, and held level in 1998; the Senate's record states 2022 as seats won rather than a net change, because four independents sat in the 118th Congress.

Because Class II seats are concentrated in specific geographic regions and political environments, continental shifts in the national mood do not always translate into linear seat changes in the Senate.

What is the generic ballot, and how well does it predict the House?

The generic ballot is a standardized polling question asking respondents whether they plan to vote for a Democratic or Republican candidate in their local House district, without naming specific individual candidates. The national aggregate it reflects is the overall House popular vote, representing every vote cast nationwide for Democratic House candidates against every vote cast for Republican candidates.

These national vote totals become official when compiled by the Clerk of the House, a publication duty dating back to 1920 in the Election Statistics series.

While the generic ballot measures overall national sentiment, a party can win the national House popular vote and still fail to capture a majority of seats. Because Representatives are elected in 435 individual single-member districts whose geographic boundaries are drawn by state governments, the distribution of voters across districts exerts a strong influence on final seat counts.

Midterm seat swings, the new maps, and the 2026 calendar.

• Nov 1994: Bill Clinton's Democrats lost 54 House seats and 9 Senate seats, shifting control of both chambers to the Republican Party.
• Nov 1998: Bill Clinton's Democrats gained four House seats while the Senate division remained unchanged at 55 Republicans and 45 Democrats.
• Nov 2002: George W. Bush's Republicans gained eight House seats and one Senate seat.
• Nov 2006: George W. Bush's Republicans lost 30 House seats and six Senate seats, transferring control of both chambers to Democrats.
• Nov 2010: Barack Obama's Democrats lost 64 House seats, marking the largest single-year House seat shift in modern midterm history.
• Nov 2014: Barack Obama's Democrats lost 13 House seats and nine Senate seats, returning the Senate to Republican control.
• Nov 2018: Donald Trump's Republicans lost 42 House seats while gaining two Senate seats, causing the House to change hands.
• Nov 2022: Joe Biden's Democrats lost nine House seats while maintaining their effective Senate majority.
• Jan 2025: The 119th Congress convened with 220 Republicans and 215 Democrats in the House, and 53 Republicans and 45 Democrats (alongside two independents) in the Senate.
• Aug 2025: The Texas Legislature passed House Bill 4, enacting a mid-decade redistricting plan recorded as PlanC2333 by the Texas Legislative Council.
• Sep 2025: Missouri enacted a revised congressional map during a special legislative session, which was subsequently upheld by state courts.
• Oct 2025: North Carolina enacted Session Law 2025-95, establishing revised congressional district boundaries for the 2026 elections.
• Nov 2025: California voters passed Proposition 50, approving interim modifications to state congressional district boundaries.
• Dec 2025: The U.S. Supreme Court issued an order permitting the contested Texas congressional map to remain in effect for the 2026 election cycle.
• Mar 2026: Congressional primary elections began in March in Texas, Arkansas, and North Carolina.
• Apr 2026: The U.S. Supreme Court decided Louisiana v. Callais, issuing a ruling concerning Voting Rights Act standards for redistricting maps.
• Nov 2026: Midterm election day takes place on Tuesday, November 3, with all 435 House seats and 33 Class II Senate seats on the ballot.
• Dec 2026: State runoff elections occur in Georgia on December 1 and Louisiana on December 12 for races requiring a second round of voting.
• Jan 2027: The 120th Congress officially assembles at noon on January 3 under the Twentieth Amendment.