The primaries should all be delayed. We can't have groups of 50+ people waiting in line for hours close together, especially people that are likely to be disproportionally elderly based on what's been happening in he primary so far. This is a public health emergency.
Groups of 50+ people don't need to be waiting in line for hours close together if election officials competently run the election. Social distancing spacing can be maintained.
This decision is best left to the states.
That's…A pretty huge if. Especially with reports of poll volunteers quitting.