2018Final results
2018 election for California's 4th District
U.S. House · California
Tom McClintock (R) won with 54.1% of the vote, defeating Jessica Morse (D) by 8.3 points.
Tom McClintockRepublican · winner
54.1%184,401
Jessica MorseDemocrat
45.9%156,253
340,654 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.
Jessica MorseTom McClintock
$3.8M
Raised by the campaign
$1.7M
$3.7M
Spent by the campaign
$1.8M
$102.2K
Cash on hand
$224.8K
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018