Jon Tester won with 50.3% of the vote (253,876 votes), ahead of Matt Rosendale with 46.8% (235,963 votes).
The margin between the first two candidates was 3.6 percentage points (17,913 votes). The party margin (Republican share minus Democratic share) was a Democratic lead of 3.6 points.
Compared with the previous comparable race in the same area, the party margin moved 21.3 points toward Democrats. The winning party changed.
504,384 votes were counted in this race, for 3 candidates or options.
More races: all races, candidates and analysis.