How the president’s party has fared in every US midterm election since 1946
Only twice in the past 20 midterms has the president’s party gained House seats. Polls suggest 2026 won’t be the third.
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Democratic presidents have suffered the biggest midterm defeats since 1946. On average, their party has lost about 29 House seats in a midterm, compared with about 23 under Republican presidents.
The largest loss came in 2010, two years after Barack Obama became the first African American elected president, when Democrats lost 64 House seats and Republicans took control of the chamber. The Democrats under Truman lost 56 seats in 1946, and under Clinton, they lost 54 in 1994, each time losing control of the House.
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The worst Republican defeats came under Dwight D Eisenhower when the party lost 50 seats in 1958 and Gerald Ford when it lost 48 in 1974. Donald Trump’s first midterm in 2018 cost Republicans 42 seats and control of the House.
Big losses often cost the president’s party its majority. In seven of the 20 midterms since 1946 (1946, 1954, 1994, 2006, 2010, 2018 and 2022), the House changed hands.
The Senate: 13 losses in 20 midterms
The president’s party has lost Senate seats in 13 of the 20 midterms since 1946 but lost control of the chamber in only six: 1946, 1954, 1986, 1994, 2006 and 2014.
Unlike the House of Representatives, where every seat is up for election every two years, only about a third of the Senate’s 100 seats are contested in each cycle because senators serve six-year terms and their elections are staggered. That means which states are voting can matter as much as the national mood.
Eisenhower’s Republicans suffered the biggest Senate loss in the period, giving up 13 seats in 1958. Truman’s Democrats lost 12 in 1946, and Obama’s Democrats lost nine in 2014, handing control of the chamber to Republicans.
At times, the two chambers have moved in opposite directions. In 1982, Ronald Reagan’s Republicans lost 26 House seats but gained one in the Senate. In 2018, Trump’s Republicans lost the House but added a Senate seat, and in 2022, Biden’s Democrats lost the House while gaining one seat in the Senate.
These split results show that a backlash against the president does not land evenly across Congress. A party can hold its ground on a favourable Senate map while losing competitive House districts.