**Mike Thompson holds a clear lead in the CA-04 general election market at 69.5% implied probability, reflecting his status as the long-serving Democratic incumbent seeking a 15th term in a district rated Solid Democratic.** Eric Jones, the other Democrat who advanced from the June 2, 2026 top-two primary, sits at 27.5%, with remaining outcomes including "Other" priced at 50%. Thompson captured roughly 41% of the primary vote compared to Jones’s 22%, underscoring the incumbent’s established voter base and constituent service record across the redrawn district covering parts of Napa, Sonoma, Sacramento, and surrounding counties. Jones, a political newcomer and self-funding challenger emphasizing generational change and cost-of-living issues, advanced but trails significantly in early positioning. The race’s heavy Democratic lean and Thompson’s decades of congressional experience drive trader consensus toward the incumbent, though the November 3 general election remains several months away.