Susan Margaret Collins won with 51.0% of the vote (417,645 votes), ahead of Sara I. Gideon with 42.4% (347,223 votes).
The margin between the first two candidates was 8.6 percentage points (70,422 votes). The party margin (Republican share minus Democratic share) was a Republican lead of 8.6 points.
Compared with the previous comparable race in the same area, the party margin moved 16.2 points toward Democrats. The winning party changed.
819,183 votes were counted in this race, for 4 candidates or options.
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