Ken Calvert holds the leading position in the CA-40 House race at 64.5% implied probability, ahead of Young Kim at 32.5%, following their June 2026 top-two primary where Calvert captured roughly 35% of the vote to Kim’s 21% amid a crowded field. Redistricting under Proposition 50 placed the two Republican incumbents in the same Orange County and Riverside County district for the November general election, turning the contest into an intra-party matchup decided largely by Republican primary voters and turnout patterns. Calvert’s stronger primary performance and established fundraising edge have anchored trader consensus on his advantage, while Kim’s advancement reflected split Democratic support among multiple challengers who failed to reach the runoff. With no major new endorsements, polling shifts, or campaign developments reported since the primary, the current pricing aligns with Calvert’s historical incumbency strength and primary momentum in the district.