The California 40th Congressional District primary resulted in two Republican incumbents, Ken Calvert and Young Kim, advancing to the general election, shutting out Democrats. - The district's voter registration is nearly 40% Republican, 31% Democrat, and 21% no party preference.
- The California Democratic Party failed to endorse a single candidate, with no one reaching the 60% threshold. - Local activists and candidates criticized the party for lack of resources and unity.
- The general election will be a Republican-on-Republican contest, leaving Democrats to regroup.