Democrats Just Pulled Off A Rare Midterm Sweep. It’s Happened Only Three Other Times Since World War II.

Democrats have taken control of both chambers of Congress in a midterm election for just the fourth time since World War II, dealing President Donald Trump a defeat that reached well beyond the usual battleground states.

The party flipped at least seven Republican-held Senate seats Tuesday, including victories in Texas, Kansas, Iowa and South Carolina. It also secured a House majority, ending Republican control of Congress for the final two years of Trump’s presidency.

The last time voters handed both chambers to the opposition party in a midterm election was 2006, when Democrats defeated President George W. Bush’s Republicans. The other two instances were in 1994 and 1946.

Historical records from the U.S. House of Representatives and the American Presidency Project show that major congressional defeats do not always result in both chambers changing hands.

The 2026 Senate results have already crossed one historical threshold. Ballotpedia’s Nov. 4 analysis found that Republicans had lost at least seven Senate seats, placing the election among the top 20% of Senate swings against a president’s party in its historical study.

That meets Ballotpedia’s definition of a Senate wave election, based on results going back to 1918.

At 1:30 a.m. ET Wednesday, Democrats had secured at least 231 House seats and 54 Senate seats, according to Ballotpedia. Several races remained uncalled, meaning the size of the final House majority could still grow.

The closest comparison is 2006. Republicans lost about 30 House seats and six Senate seats that year as voters turned against Bush’s administration during the Iraq war. Democrats took both chambers, gaining control of Congress for the first time in 12 years.

The 1994 midterms produced an even bigger House reversal. Republicans gained 54 seats under President Bill Clinton, ending four decades of Democratic control of the chamber. They also picked up eight Senate seats.

In 1946, Republicans won both chambers during President Harry Truman’s first term, gaining more than 50 House seats and making substantial gains in the Senate.

But two other major midterm waves offer a different comparison. Republicans gained 63 House seats in 2010 during President Barack Obama’s first term, one of the largest House swings in modern American history. They also picked up six Senate seats but failed to take control of the upper chamber.

Democrats made major gains during Trump’s first term in 2018, winning about 40 additional House seats. Republicans, however, retained control of the Senate and increased their majority there.

This time, Democrats won both. The Senate results were particularly notable because several victories came in states that had not elected Democratic senators for decades.

Kansas elected its first Democratic senator since 1932 after pastor Adam Hamilton defeated Republican incumbent Roger Marshall. In Texas, James Talarico became the first Democrat to win a Senate election since 1988.

South Carolina elected its first Democratic senator since 1998, while Roy Cooper won a Republican-held seat in North Carolina. All four states had voted for Trump in the 2024 presidential election.

The election also produced an unusual result involving Senate control. According to Ballotpedia, this is the first time since 1954 that the party winning the Senate in one even-year election lost control in the next election cycle.

The final House tally will determine whether Democrats’ gains rival the largest midterm waves of recent decades.

Ballotpedia’s historical benchmark for a House wave is a net gain of 48 seats. Democrats had gained at least 18 in its early Wednesday count, with many races still awaiting results.

The Senate victory, however, already has consequences for Trump. Democrats will be able to block presidential nominees, while their House majority can investigate the administration and challenge its legislative priorities. The new Congress takes office on January 3, 2027.