Incumbent Mike Thompson leads trader pricing in the CA-04 race after securing first place in the June 2 top-two primary with 41 percent of the vote, advancing alongside Democratic challenger Eric Jones. Thompson benefits from decades of incumbency since 1999, broad establishment endorsements from party leaders, and a district rated Solid Democratic by major forecasters following recent redistricting. Jones, a younger progressive former venture capitalist, positioned himself as a generational alternative focused on affordability but trails significantly. With no Republican advancing and the November general election set between the two Democrats in a district with a strong Democratic lean, trader consensus reflects Thompson’s structural advantages in name recognition and fundraising while acknowledging the intraparty contest.