2018Final results
2018 election for Idaho's 2nd District
U.S. House · Idaho
Mike Simpson (R) won with 60.7% of the vote, defeating C. Aaron Swisher (D) by 21.3 points.
Mike SimpsonRepublican · winner
60.7%170,274
C. Aaron SwisherDemocrat
39.3%110,381
280,655 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.
C. Aaron SwisherMike Simpson
$133.3K
Raised by the campaign
$1.1M
$125.8K
Spent by the campaign
$993.8K
$7.4K
Cash on hand
$267.1K
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018