Poll shows Biden, Sanders beating Trump in battleground Wisconsin

Former Vice President Joe BidenJoe BidenUnited Auto Workers strike against GM poised to head into eighth day Trump doubles down on call to investigate Biden after whistleblower complaint: 'That's the real story' Omar: Biden not the candidate to 'tackle a lot of the systematic challenges that we have' MORE leads President TrumpDonald John TrumpTrump's top adviser on Asia to serve as deputy national security adviser United Auto Workers strike against GM poised to head into eighth day Trump doubles down on call to investigate Biden after whistleblower complaint: 'That's the real story' MORE by nine points among Wisconsin voters while Sen. Bernie SandersBernie SandersOmar: Biden not the candidate to 'tackle a lot of the systematic challenges that we have' Seven takeaways from a busy Democratic presidential campaign weekend in Iowa Democrats go all out to court young voters for 2020 MORE (I-Vt.) leads by four points, according to a new Marquette University Law poll released on Wednesday. 

Fifty-one percent of voters in the state said they supported Biden, while only 42 percent voiced support for Trump, according to the survey.

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The same survey found that Sanders led Trump by four points, or 48 percent to 44 percent. 

Meanwhile, the president is neck-and-neck with Sen. Elizabeth WarrenElizabeth Ann WarrenUnited Auto Workers strike against GM poised to head into eighth day Omar: Biden not the candidate to 'tackle a lot of the systematic challenges that we have' Seven takeaways from a busy Democratic presidential campaign weekend in Iowa MORE (D-Mass.), with both receiving 45 percent support. 

Trump was also tied with Sen. Kamala HarrisKamala Devi HarrisSeven takeaways from a busy Democratic presidential campaign weekend in Iowa Fracking ban could have unintended consequence of boosting coal Poll: Voters back Medicare expansion, keeping private insurance MORE (D-Calif.), with both coming in at 44 percent support. 

Wisconsin will likely be a must-win state for Democrats in 2020 given that President Trump flipped the state from blue to red, helping propel him to his surprise victory in 2016.

Biden also led the Democratic primary field in Wisconsin, according to the poll, with 28 percent of those surveyed naming him as their first choice. 

Sanders was the first choice of 20 percent of the same pool of respondents, while Warren was the first choice of 17 percent of respondents. 

Sanders had won Wisconsin the 2016 Democratic primary race with 56 percent of the vote. 

Meanwhile, the economy, likely a key electoral issue in 2020, elicited split views from voters in Wisconsin. Forty-nine percent of respondents said they approved of the president's handling of the economy, while 50 percent said they disapproved.  

The Marquette University Law School poll was conducted from August 25-29, 2019 among 800 registered Wisconsin voters. The margin of error is plus or minus 3.9 percentage points. Among registered Democrats, Democratic-leaners, and independents, the margin of error is plus or minus 5.3 percentage points.