Sanders has 51 percent support, according to the poll, while Clinton has 43 percent support.

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Just two weeks ago, the same poll showed Clinton beating Sanders by 6 points in the state, 50 to 44 percent.

Both Democratic candidates have high favorable ratings among likely Democratic voters in Wisconsin, according to the poll. Sanders has an 83 percent favorable rating, and Clinton holds 70 percent favorable rating.

Sanders lead Clinton among voters ages 18–34 and 35–54, while Clinton is leading with older voters, a trend that has been seen in other contests. Sanders also leads the front-runner among independent voters.

Sanders also leads both Trump, 51 to 37 percent and Cruz 50 to 41 percent.

The Emerson College poll was conducted from March 30 to April 3 among 542 likely Democratic primary voters. It has a margin of error of 4.2 percent. The general election sample included 1,198 likely general election voters and has a margin of error of 2.8 percent.