Incumbents Ken Calvert (R) and Young Kim (R) are running in the general election to represent California's 40th Congressional District on Nov. 3. They defeated six other candidates to win the top-two primary on June 2.
Heading into the election, Calvert represents California's 41st Congressional District, and Kim represents the 40th District. The two incumbents were drawn into the same district as a result of Proposition 50, a redistricting amendment voters approved in November 2025. According to ABC7's Josh Haskell, Calvert represents 51% of the new district and Kim represents 35% of the new district. In the primary, Calvert received 35% of the vote and Kim 21%.
With an intraparty election, negative advertisements have been central to each campaign. Both candidates have released advertisements claiming the other is liberal or not enough of a supporter of President Donald Trump (R). One Calvert advertisement claims Kim is a RINO (Republican in Name Only) who threatened to "whip [Trump's] butt." Kim released an advertisement showing headlines from the 1990's coverage of Calvert being in a car with a prostitute. The advertisement says, "Screwing us, servicing himself, sabotaging Trump. Ken Calvert, what a sleazebag."
