The CA-04 general election pits longtime incumbent Mike Thompson against Democratic challenger Eric Jones in a top-two contest shaped by 2025 redistricting under Proposition 50, which added more rural and conservative-leaning areas to the district. Recent polls funded by the Jones campaign show the venture capitalist leading by double digits, citing voter desire for generational change and higher fundraising totals, while independent forecasts rate the seat Safe Democratic for the incumbent. Primary results and a Republican candidate's endorsement of Jones have created unusual cross-party dynamics, with turnout among independents and Republican voters in newly added counties likely to determine separation before the November 3 vote.