California's 27th congressional district holds its nonpartisan primary on June 2, 2026, under the top-two system that advances the two highest vote-getters to the November general election regardless of party. Incumbent Democrat George Whitesides, who flipped the seat in 2024, faces Democratic challengers Caleb Norwood and Roberto Ramos along with Republican Jason Gibbs. Redistricting via Proposition 50 shifted the district's boundaries, incorporating more Democratic-leaning areas in the northwest San Fernando Valley while removing conservative pockets, producing a more favorable partisan index for the incumbent. Candidate filing closed in March with limited public polling or major endorsements reported since then, leaving fundraising reports and local campaign activity as the primary signals traders monitor before primary day.