Poll shows Biden, Sanders beating Trump in battleground Wisconsin

Former Vice President Joe BidenJoe BidenCan Republicans handle the aftermath of Donald Trump? Biden seeks to supplant Trump in Georgia Trump's Mount Rushmore stunt will backfire MORE leads President TrumpDonald John Trump Trump responds to calls to tear down monuments with creation of 'National Garden' of statues Trump: Children are taught in school to 'hate their own country' Trump accuses those tearing down statues of wanting to 'overthrow the American Revolution' MORE by nine points among Wisconsin voters while Sen. Bernie SandersBernie SandersDemocratic senator will introduce bill mandating social distancing on flights after flying on packed flight Neil Young opposes use of his music at Trump Mt Rushmore event: 'I stand in solidarity with the Lakota Sioux' Democratic strategist Andrew Feldman says Biden is moving left 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 WarrenThe Hill's Campaign Report: Biden chips away at Trump's fundraising advantage Warnock raises almost M in Georgia Senate race in second quarter The Hill's Morning Report - Trump lays low as approval hits 18-month low MORE (D-Mass.), with both receiving 45 percent support. 

Trump was also tied with Sen. Kamala HarrisKamala Devi HarrisSenators push foreign media to disclose if they are registered as foreign agents Warnock raises almost M in Georgia Senate race in second quarter Liberal veterans group urges Biden to name Duckworth VP 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.