2018Final results
2018 election for Oklahoma's 2nd District
U.S. House · Oklahoma
Markwayne Mullin (R) won with 65.0% of the vote, defeating Jason Nichols (D) by 34.9 points.
Markwayne MullinRepublican · winner
65.0%140,451
Jason NicholsDemocrat
30.1%65,021
John ForemanIndependent
3.0%6,390
Richie CastaldoLibertarian
1.9%4,140
216,002 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.
Jason NicholsMarkwayne Mullin
$138K
Raised by the campaign
$1.6M
$128.8K
Spent by the campaign
$1.7M
$10.2K
Cash on hand
$28K
Other candidates' campaigns: Richie Castaldo $20.2K.
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018
The candidates
Markwayne Mullin (R)Jason Nichols (D)
Also on the ballot: John Foreman (Independent), 3.0%; Richie Castaldo (Libertarian), 1.9%