As the state announced 15 new coronavirus deaths, Republicans insisted on in-person voting in the hopes lower turnout would help them hold on to a critical court seat.
Wisconsin Governor Tony Evers, a Democrat, tried twice to postpone the election.
First, he called for the Republican-controlled legislature to do so in a special session, but they gaveled out the session in a matter of seconds without taking action. Then he issued an emergency order moving the election to June, but the Republican-allied judges on the state Supreme Court overruled that.
The Democratic Party also sued to expand absentee balloting, but all five Republican-appointed U.S. Supreme Court justices ruled against it.