Transcript for Voters in Arizona, Illinois and Florida cast their ballots
The U.S. And the rest of the world hoping that doesn't happen. James, thank you. And three states going ahead with presidential primaries, Florida, Illinois, and Arizona. One state cancelling. Here's Mary Bruce. Reporter: An election night like we've never seen before. In Arizona, voters lined up in face masks. Extra safety precautions at the polls in Florida. And in Illinois, too. Voters tonight weighing the risk of casting their ballot. I was worried about looking crazy but then I thought, who cares, right? This is more important. Reporter: In Ohio, governor Mike dewine made a last-minute decision to postpone the primary, defying a judge's order to let the vote proceed. Is it a perfect decision? No, absolutely not. It does preserve people's constitutional rights and it does not require them to choose between their health and exercising their constitutional right. Reporter: At the white house, our Jon Karl pressed the president. What are you doing to ensure further elections? If we're still in this situation a month from now, two months from now? What I am doing, Jon, is very simple. We're getting rid of this virus. Reporter: As for the candidates, they're walking a fine line. Joe Biden and Bernie Sanders are cautiously encouraging supporters to vote, but only if
This transcript has been automatically generated and may not be 100% accurate.