The new results put the incumbent up by 6 points, with 53 percent of voters saying they will vote for Johnson and 47 percent saying the same for Barnes.
Voters on both sides of the aisle overwhelmingly support their respective party’s nominee, with 99% of Democrats supporting Barnes and 97% of Republicans supporting Johnson. Independents, meanwhile, split 50-50 between candidates.
Other recent polls have shown Johnson with a smaller lead. In recent weeks, a Marquette Law School poll showed the incumbent up 2 points, a Fox News poll found Johnson up 3 points and an Emerson College Polling-The Hill poll had him up 4 points.
The closely watched race could be critical to which party controls the Senate going forward.
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Johnson last week sidestepped a question about whether he would concede if he lost the Senate race, saying “I certainly hope I can, but I can’t predict what the Democrats might have planned.”
Conducted Nov. 2-5, the Data for Progress poll polled 1,504 voters like Wisconsin and had a margin of error of plus or minus 2 percentage points.