2018Flipped from RepublicanFinal results
2018 election for California's 10th District
U.S. House · California
Josh Harder (D) won with 52.3% of the vote, defeating Jeff Denham (R) by 4.5 points, a seat Republicans won last time.
Josh HarderDemocrat · winner
52.3%115,945
Jeff DenhamRepublican
47.7%105,955
221,900 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Josh HarderJeff Denham
$8.4M
Raised by the campaign
$4.9M
$8.4M
Spent by the campaign
$4.9M
$20.2K
Cash on hand
$306.6K
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018