Bernie SandersBernard (Bernie) SandersDe Blasio headed to Iowa to speak at political fundraiser Yes, spills happen — but pipelines are still the safest way to move oil Why sexual harassment discussions include lawmakers talking about Bill Clinton’s past MORE has opened up a 4-point lead over Democratic presidential rival Hillary ClintonHillary Diane Rodham ClintonO’Malley tells Dems not to fear Trump FBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Pelosi blasts California Republicans for supporting tax bill MORE among voters in Wisconsin, according to a Marquette Law School poll released Wednesday afternoon.

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When asked to pick between Sanders, Clinton and someone else, 49.2 percent of likely Democratic primary voters opted for the Vermont senator, while 44.9 chose the former secretary of State.

None of the participants named a third candidate, but 5.5 percent said they have yet to make up their mind.

In the February version of the same poll, Sanders led Clinton 44 percent to 43 percent.

The April 5 Wisconsin primary, with its 96 delegates, is a must-win for Sanders, who is looking to hold on to the momentum he has been riding since sweeping all three Democratic elections on Saturday.

Sanders has won five of the last six contests, and a win in Wisconsin would further his argument that Clinton is a “weak front-runner” who remains vulnerable to defeat.

The poll surveyed 405 likely Democratic voters March 24–28. Its margin of error is 6.3 percentage points.