Incumbent Mike Thompson (D) and Eric Jones (D) advanced from the top-two primary for California's 4th Congressional District on June 2, 2026
In California's 4th Congressional District primary on June 2, 2026, incumbent Democrat Mike Thompson and fellow Democrat Eric Jones advanced to the general election under the state's top-two primary system. Six Republican candidates and one independent also competed in the race. Thompson and Jones had led in fundraising and media coverage heading into the primary.
Key Points
- Both advancing candidates are Democrats, setting up a general election between two members of the same party
- Thompson, the incumbent, secured enough support to advance despite competition from within his own party
- Six Republican candidates were unable to advance from the primary, significantly weakening GOP representation in this district