Incumbent Rep. Mike Thompson’s long tenure and strong institutional support from Gov. Newsom, the California Democratic Party, and major labor unions anchor trader expectations in the June 2 top-two primary for California’s 4th Congressional District. Eric Jones, the leading challenger, has mounted a credible campaign focused on housing affordability and generational change, backed by substantial tech-sector fundraising that positions him as the probable second-place finisher. A crowded Republican field of six candidates fragments conservative votes, reducing any realistic chance of a GOP advance in the D+8 district. Recent FEC filings and mutual attack ads between the two Democrats have sharpened the contest for the second slot, while redistricting adjustments that added conservative-leaning counties have not shifted the overall partisan balance enough to alter advance probabilities before ballots are cast.