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Democratic former U.S. Sen. Russ Feingold held a 10-point lead over Republican U.S. Sen. Ron Johnson, in a poll released Monday by Public Policy Polling, a Democratic firm.

Fifty-one percent of those polled said they would vote for Feingold, and 41% for Johnson.

When asked if Johnson should unendorse presumptive Repubilcan presidential nominee Donald Trump, 51% said that he should, 30% said he should not, and 19% were not sure.

The survey of 853 Wisconsin voters was conducted Wednesday and Thursday and commissioned by the liberal advocacy group MoveOn.org.

The latest Marquette University Law School Poll will be released Wednesday.