That didn't stop voters on Super Tuesday.
Anyway, we don't even know if this pandemic will still be relevant by November. Regardless, it should still be used against Trump as an example of how incompetent his administration is.
How has his administration been incompetent?
Seriously, what the hell are you supposed to do when something like this is spreading all over the world?!
Wave a wand and somehow create a vaccine out of thin air?
Don't cripple the agencies responsible for preparedness ahead of time.
Respond quickly when the first threat became apparent, rather than wasting weeks hoping it would blow over
Don't minimize the potential threat or current spread.
Don't spread disinformation like "in a couple of months it will all be over".
In general, don't put the President's political interests ahead of the nation's interests.
...etc...