2012Final results
2012 election for California's 42nd District
U.S. House · California
Ken Calvert (R) won with 60.6% of the vote, defeating Michael Williamson (D) by 21.2 points.
Ken CalvertRepublican · winner
60.6%130,245
Michael WilliamsonDemocrat
39.4%84,702
214,947 votes
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
The seat over time
D − R margin in this seat's races around 2012
Races before and after
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
Money in this race
Each line compares the two campaigns on one scale.
No DemocratKen Calvert
—
Raised by the campaign
$1.1M
—
Spent by the campaign
$847K
—
Cash on hand
$419.3K
Campaign money: FEC, through Dec 31, 2012.
Source: FEC campaign filingsUpdated Dec 31, 2012