Hillary was a terrible candidate but it's not possible that Biden is even electable. He may not make it to November. I seriously question anyone who is considering voting Biden.
Haters are more fervent in their hate than supporters in their support. This election is about how many Trump haters vote. With Hillary, many sat home because they couldn't in good conscience vote for an unlikeable pyscho swamp monster. With Biden, he's more likeable, though he's a swamp monster too.
But they may hold their noses and vote for him where they couldn't for Hillary.