Tester won by 49 percentage points to Rosendale's 48.1 percent, with 92 percent of precincts reporting, per The New York Times.
Tester was one of several red-state Democrats facing a tough path to re-election, seeing as his state went for President Trump by more than 20 points in 2016. Still, Tester generally polled above the Trump-supporting Rosendale throughout the race.
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