2022Final results
2022 election for California's 21st District
U.S. House · California
Jim Costa (D) won with 54.1% of the vote, defeating Michael Maher (R) by 8.2 points.
Jim CostaDemocrat · winner
54.1%68,120
Michael MaherRepublican
45.9%57,850
125,970 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.
Jim CostaMichael Maher
$2M
Raised by the campaign
$311.8K
$2.1M
Spent by the campaign
$309.6K
$389.1K
Cash on hand
$2.2K
Campaign money: FEC, through Dec 31, 2022.
Source: FEC campaign filingsUpdated Dec 31, 2022