Coronavirus is dominating. Three of four crucial states are going ahead with elections Tuesday that could determine the Democratic presidential nominee.

So much has changed since the last round of primaries just a week ago. Coronavirus is dominating everything, and elections are on the back burner.

Some states have postponed their primaries over coronavirus concerns, and officials in Ohio, which is one of the four big states that was supposed to vote Tuesday, have suspended in-person voting.

But primaries go on in Florida, Illinois and Arizona. It’s a crucial set of contests. Former Vice President Joe Biden has an approximately 150-delegate lead over Vermont Sen. Bernie Sanders, and 441 delegates are at stake Tuesday.