Incumbent Democratic Representative George Whitesides faces three party challengers and one Republican in California’s June 2 top-two primary for the 27th Congressional District. The seat’s boundaries shifted after voters approved Proposition 50 in November 2025, removing some conservative northern Los Angeles County suburbs and altering the district’s partisan balance. Jason Gibbs, a Santa Clarita city councilmember and engineer, is the sole Republican on the ballot following the withdrawal of another GOP candidate. Caleb Norwood and Roberto Ramos, both Democrats, round out the field. With the top two finishers advancing regardless of party, trader attention centers on whether Whitesides secures first place and which opponent joins him on the November general-election ballot. No major late developments have altered the candidate lineup since certification in late March.