As long as the Biden campaign just doesn't get too cocky during this election. We have 4 1/2 months until Election Day. The real campaign begins after the DNC & RNC, that's when all wheels get rolling for the Election.
He does, at least at the moment, appear that he's treating every swing state like they're down and need to gain ground--this in itself gives me the impression the party learned the right lesson for once, given that Hillary appeared to take the Rust Belt for granted--especially Wisconsin and Michigan.