Corona will hurt Dem's primary elections, Potus not so much
Look at the huge voting numbers Potus has racked up state after state, huge record breaking voter turnout even though it's not needed, the voters don't need to turn out in this very high numbers because Potus runs unchallenged on the Repub ticket. So Potus having to cancel rallies won't hurt his chances, the numbers say it all.
Now on the other hand, the Dem's are in trouble and they need to get their base out to vote. With Potus declaring it's just common sense to protect citizens and cancel the rallies, it's a safety factor, that will force Biden and Sanders who NEED to hold rallies to follow suit and cancel them or be made to look like they don't care about the citizens.
BOOMERANG again!
Anyone sick of winning yet??