Biden benefits from a fractured field in IA and NH and he's going to run the table down south, it's his nomination to lose if these polls are accurate
He was in 4th in the most recent IA poll. Really, all the candidates benefit from the fractured field but none of them have been able to capitalize on it.
That poll in IA showed a 4-way race as does essentialy this poll. But Biden has the advantage not being in a 4-way race in SC and other southern and midwestern states looks good for him. I don't think he will win NH but if this poll is somewhere close to the truth it's a great news for him.