2020Final results
2020 election for Montana's at-large District
U.S. House · Montana
Matthew M. Rosendale, Sr. (R) won with 56.4% of the vote, defeating Kathleen Williams (D) by 12.8 points.
Matthew M. Rosendale, Sr.Republican · winner
56.4%339,169
Kathleen WilliamsDemocrat
43.6%262,340
601,509 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET
The seat over time
D − R margin in this seat's races around 2020
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Kathleen WilliamsMatthew M. Rosendale, Sr.
$6.3M
Raised by the campaign
$4M
$6.4M
Spent by the campaign
$3.8M
$6.4K
Cash on hand
$262.8K
Campaign money: FEC, through Dec 31, 2020.
Source: FEC campaign filingsUpdated Dec 31, 2020