2018Final results
2018 election for Arizona's 1st District
U.S. House · Arizona
Tom O’Halleran (D) won with 53.8% of the vote, defeating Wendy Rogers (R) by 7.7 points.
Tom O’HalleranDemocrat · winner
53.8%143,240
Wendy RogersRepublican
46.1%122,784
266,487 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.
Tom O’HalleranWendy Rogers
$2.7M
Raised by the campaign
$1.4M
$2.8M
Spent by the campaign
$1.4M
$5.9K
Cash on hand
$1.7K
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018