HOUSE
California CA-04 House2026
RACE AT A GLANCE
RACE TYPE
Incumbent running
Mike Thompson (D)
COOK PARTISAN VOTING INDEX
Last updated : Nov 17, 2025D +50
R +50
D +8
Race summary
Rep. Mike Thompson, 75, finds himself running in a seat that’s half new to him after redistricting.Key Dates
Filing Deadline: Mar 6, 2026
Primary Election: Jun 2, 2026
INCUMBENT
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INCUMBENT
Full Bio:
THOMPSON, Michael, a Representative from California; born in St. Helena, Napa County,
Calif., January 24, 1951; graduated from St. Helena High School, St. Helena,
Calif.; B.A., California State University, Chico, Calif., 1982; M.A.,
California State University, Chico, Calif., 1996; United States Army,
1969-1972; California state assembly fellow, 1982-1983; member of the
California state senate, 1990-1998; elected as a Democrat to the One Hundred
Sixth and to the nine succeeding Congresses (January 3,
1999-present).
Source: Bioguide
CANDIDATES
Republicans
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DISTRICT DATA
California - 04
Napa and Gold Country
Population Breakdown
Source: 2020 Census (VAP) for 2026
Past Presidential Results from this District
2024 Election Results
Source: Dave Leip
2020 Election Results
Source: Dave's Redistricting/VEST
RACE ANALYSIS
Race Analysis
Updated: Jun 2, 2026
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