2018Flipped from RepublicanFinal results
2018 election for California's 45th District
U.S. House · California
Katie Porter (D) won with 52.1% of the vote, defeating Mimi Walters (R) by 4.1 points, a seat Republicans won last time.
Katie PorterDemocrat · winner
52.1%158,906
Mimi WaltersRepublican
47.9%146,383
305,289 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.
Katie PorterMimi Walters
$7M
Raised by the campaign
$4.9M
$6.9M
Spent by the campaign
$5.3M
$83.7K
Cash on hand
$50.1K
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018