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The two men railed against Donald Trump and urged voters to return their ballots early, as polls show a close race in the state.
Gov. Tim Walz of Minnesota raced across battleground Wisconsin on Tuesday, exhorting voters to get to the polls on the state’s first day of early voting and just two weeks before Election Day.
At a rally in Madison, Mr. Walz appeared alongside former President Barack Obama for the first time on the campaign trail, giving Mr. Obama a bro hug onstage. The two took turns, in successive speeches, laying into former President Donald J. Trump and stressing the urgency of the moment to vote for Vice President Kamala Harris, who leads the Democratic presidential ticket with Mr. Walz.
“Our team is running like everything is on the line, because everything’s on the line,” Mr. Walz told the crowd of thousands at an event center. He urged voters to avoid complacency, suggesting that a second term for Mr. Trump would be even more chaotic than the first and that he was “far more dangerous” now.
“He is not the 2016 Donald Trump — this is a brand-new version,” Mr. Walz said. “The consequences of putting him back into office are deadly serious.”
Mr. Obama was lighthearted as he began, making jokes and telling the audience that Mr. Walz was “the kind of person who should be in politics.”
“Love that man,” he added, as Mr. Walz left for his next stop.