Luke Bronin has defeated incumbent John Larson in a Democratic primary for Connecticut's 1st Congressional District. This marks the seventh House Democrat ousted in their primary this year, a notable number for the 21st century. Bronin's challenge gained momentum after Larson experienced a public health incident during a House speech. Bronin secured the endorsement of the state Democratic Party, while Larson had support from national Democratic leadership. Bronin also out-raised Larson, bringing in more campaign funds. A significant outside spender, VoteVets, heavily supported Bronin. Larson's top outside supporter was Defend the Vote. Bronin's campaign centered on the theme of generational change within Congress and the Democratic Party. He argued that it was time for new leadership given the high stakes. Both candidates sought to appeal to progressive voters, though Bronin was labeled a "corporate Democrat" by some. Larson's defeat is part of a trend of older Democrats losing to younger primary challengers this year.