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Fundraising in California's 4th Congressional District

Incumbent Mike Thompson is up for election in California's 4th Congressional District in 2026. This race is rated as Solid D. We estimate that $4.75M has been spent on this race over the last two years. Democrats have outspent Republicans by $4.71M over that time period, per our estimates.

Cumulative Spending by Party

Note: Recent data is often incomplete due to lags between spending and disclosure

Outside Spending

Committee
Candidate
Support/Oppose
Amount
Date
Description