2022Final results
2022 election for California's 4th District
U.S. House · California
Mike Thompson (D) won with 67.8% of the vote, defeating Matt Brock (R) by 35.6 points.
Mike ThompsonDemocrat · winner
67.8%176,900
Matt BrockRepublican
32.2%84,007
260,907 votes
Source: MIT Election Data and Science LabUpdated Oct 2, 2026, 5:14 AM ET
The seat over time
D − R margin in this seat's races around 2022
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 2, 2026, 5:14 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Mike ThompsonMatt Brock
$2.3M
Raised by the campaign
$11.3K
$2.4M
Spent by the campaign
$11.2K
$1.6M
Cash on hand
$23
Campaign money: FEC, through Dec 31, 2022.
Source: FEC campaign filingsUpdated Dec 31, 2022