MADISON - Thousands of Wisconsin voters waited hours in line to cast ballots and the National Guard staffed overcrowded polling stations on Tuesday, straining the state's ability to hold a presidential primary election under the lash of an escalating pandemic.

At the same time, many voters said they did not receive their requested absentee ballots and, unwilling to violate a stay-at-home order to vote in person, accepted their votes would not be counted....