It's NOT a vaccine if it only works for a couple months.

Yeah, this could be the case.

Last time I checked Trump was the one responsible for the vaccine, not Biden or Harris.

Really?
'Cuz other liberals insisted we not give Trump credit for it because it was developed and funded outside the U.S.
Granted, that means Bidden and Harris aren't responsible for it either. But they will be responsible for how they incorporate it into the U.S. recovery plans.