Top-two primary
All candidates run in one primary regardless of party and the two with the most votes advance, so two candidates of the same party can meet in November. The forecast then marks the seat as safe for that party.
California › U.S. House of Representatives · November 3, 2026 · Updated Oct 16, 2026
California's 4th District
D vs DTop twoSame-party general election. Two Democrats advanced to November: the seat stays Democratic.
Mike Thompson has no major-party opponent.
Mike Thompson has no major-party opponent.
How this race is decided
The candidates
Democratic
Eric Jones
Business owner
- Experience
- No elected office
- Raised
- $8.4M
- From individuals
- $3M
- Spent
- $7.7M
- Cash on hand
- $655.7K
Money: FEC, through Jun 30, 2026.
DemocraticIncumbent
Mike Thompson
Incumbent U.S. representative
- Experience
- Statewide office or Congress
- Raised
- $4.2M
- From individuals
- $2.3M
- Spent
- $4.3M
- Cash on hand
- $1.1M
Money: FEC, through Jun 30, 2026.
The district
Lean D+17: how much more Democratic or Republican than the nation it votes for president.
Presidential vote
Precinct results re-aggregated to the current district lines.
Who lives here
- Population
- 817,651
- People per km²
- 64
- Adults with a B.A.+
- 34%
- White, no degree
- 34%of adults
- White 50%
- Hispanic 31%
- Black 2%
- Asian 10%
- Other / multiracial 7%
American Community Survey 2020–2024, aggregated from census tracts.
Past results
Results in the same-numbered district; earlier elections may have used different lines.
2024 Earlier district lines
341,965 votes · D+32.9✓ Mike Thompson (D)66.5%
John Munn (R)33.5%
2024 President Vote in this district
335,027 two-party votes · D+15.0 · D+16.5 vs. the nation✓ Kamala Harris (D)57.5%
Donald Trump (R)42.5%
2022 Earlier district lines
260,907 votes · D+35.6✓ Mike Thompson (D)67.8%
Matt Brock (R)32.2%
2020 Earlier district lines
442,022 votes · R+11.9✓ Tom McClintock (R)55.9%
Brynne S Kennedy (D)44.1%
2020 President Vote in this district
352,805 two-party votes · D+21.6 · D+17.0 vs. the nation✓ Joe Biden (D)60.8%
Donald Trump (R)39.2%
2018 Earlier district lines
340,654 votes · R+8.3✓ Tom McClintock (R)54.1%
Jessica Morse (D)45.9%
2016 Earlier district lines
350,978 votes · R+25.4✓ Tom McClintock (R)62.7%
Robert W Derlet (D)37.3%
2016 President Vote in this district
274,504 two-party votes · D+21.6 · D+19.4 vs. the nation✓ Hillary Clinton (D)60.8%
Donald Trump (R)39.2%