WaPo:

Voters, campaigns and election officials in four states holding contests Tuesday are braced for a presidential primary day unlike any in memory, as the surging threat of the novel coronavirus has forced major changes at voting locations, rattled poll workers and left voters worried about how to cast their ballots.

In Arizona, Florida, Illinois and Ohio, election officials have raced to replace poll workers who have said they will not show Tuesday, supply thousands of precincts with sanitizing supplies, and notify voters whose polling locations, many in senior facilities, have been moved as a result of the pandemic.

Voters, meanwhile, have flooded information hotlines. Among their urgent questions: where to vote, how to deliver a ballot if they are under quarantine and how to vote if they registered while attending a college that is now closed.