Poll Biden tops Trump in Wisconsin in hypothetical head to head matchup Politics Biden is up over Trump by 51 percent to 42 percent among registered voters in Wisconsin. The President also trails Sen. Bernie Sanders of Vermont, who tops Trump 48 percent to 44 percent , just barely outside the margin of error. Trump is tied against Sens. Elizabeth Warren of Massachusetts 45 percent each and Kamala Harris of California 44 percent each . Numbers this far out from a general election are hard to read, and could change between now and November 2020. They should be thought of as a snapshot in time rather than a predictor of the future. Among the Democratic candidates, Biden leads the pack with 28 percent of registered Democrats, Democratic leaning independents and independents who dont lean toward either party saying he was their first choice, followed by 20 percent for Sanders and 17 percent for Warren. Sanders beat out former Secretary of State Hillary Clinton in the 2016 Wisconsin Democratic primary, 57 percent to 43 percent . South Bend, Indiana, Mayor Pete Buttigieg received 6 percent support in the poll, followed by Harris at 3 percent and businessman Andrew Yang with 2 percent . All other candidates received 1 percent or less in the poll. More than 1 in 10 voters 13 percent said they didnt know who their first choices for the Democratic nominee were. Biden is by far the most favorable candidate: 70 percent of the Democratic sample had a positive opinion of him, followed by 63 percent for Sanders, 53 percent for Warren, 37 percent for Buttigieg and 35 percent for Harris. “Large portion of WI Dem voters dont have a favorable or unfavorable opinion of prez candidates yet, other than Biden and Sanders,” Charles Franklin, director of the MU Law poll, . Just slightly more approve of the job Trump is doing than plan to vote for him in 2020 at this point. Trump receives a higher approval rating in Wisconsin than he does nationally: 45 percent approve of the job hes doing as President and 53 percent disapprove relatively unchanged since April 46 percent approved, 52 percent disapproved . His favorable was just slightly lower: 42 percent favorable, 53 percent unfavorable. The Marquette University Law School poll was conducted by phone from August 25 through 29 among a random sample of 800 registered voters with a margin of sampling error of plus or minus 3.9 percentage points. The survey includes a sample of 444 registered Democrats, independents who lean Democratic and pure independents, with a margin of sampling error of plus or minus 5.3 percentage points.