2018Final results
2018 election for Montana's at-large District
U.S. House · Montana
Greg Gianforte (R) won with 50.9% of the vote, defeating Kathleen Williams (D) by 4.6 points.
Greg GianforteRepublican · winner
50.9%256,661
Kathleen WilliamsDemocrat
46.2%233,284
Elinor SwansonLibertarian
2.9%14,476
504,421 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.
Kathleen WilliamsGreg Gianforte
$4.2M
Raised by the campaign
$9.8M
$4.1M
Spent by the campaign
$9.8M
$37K
Cash on hand
$31.1K
Other candidates' campaigns: Elinor Swanson $12.8K.
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018