2018Flipped from RepublicanFinal results
2018 election for California's 21st District
U.S. House · California
TJ Cox (D) won with 50.4% of the vote, defeating David Valadao (R) by 0.8 points, a seat Republicans won last time.
TJ CoxDemocrat · winner
50.4%57,239
David ValadaoRepublican
49.6%56,377
113,616 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.
TJ CoxDavid Valadao
$3M
Raised by the campaign
$3.3M
$2.9M
Spent by the campaign
$3.3M
$54.8K
Cash on hand
$78.9K
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018