The already topsy-turvy Democratic presidential contest is being upended again by the coronavirus, as states weigh whether to delay balloting and prevent in-person voting.

Monday evening, Ohio Gov. Mike DeWine invoked a health emergency to close the polls in the state's primary Tuesday, after a judge rejected his recommendation to postpone voting because of the coronavirus threat.

Polls were set to open at 6:30 a.m., but DeWine said in a statement late Monday that the state's health director would issue an order closing them while officials seek a remedy through the courts "to extend voting options so that every voter who wants to vote will be granted that opportunity."