Taking 1 state, the home state of one of the candidate’s and extrapolating that to the entire country is pretty shaky. It’s not like their aren’t national polls to look at.
I remember checking the total dem votes and the total rep. Votes for NY in the primaries. It would take more than a miracle and at least a couple hundred thousand dem votes to switch for him to win NY. But I don’t believe the margin that this poll has, either.