Incumbent Mike Thompson holds a strong position in the CA-04 general election matchup against fellow Democrat Eric Jones, reflecting his 27-year tenure, established fundraising from PACs and party sources, and endorsements from the California Democratic Party. The June 2026 top-two primary advanced both candidates after Thompson secured 41% and Jones 22%, with Republican Raymond Riehle finishing third at 21% before endorsing Jones and aiding efforts to mobilize conservative voters in the redrawn district. Jones, a former venture capitalist, has self-funded significantly and positioned his campaign around affordability and generational change, yet forecasters rate the seat Solid Democratic. No major late-breaking developments have altered the primary dynamics in recent weeks ahead of the November 3 vote.