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Hillary needs to win the remaining delagates 60/40(ish) to pull even last time I checked (there's been shiftage in IA, and of course TX with more pledged delegates, plus one or two SD to Obama).
Naturally, I don't have a clue as to what Nutter means to this race, or if a mere 70% of the Black vote is "failure". But it seems like a reality based speculation, unlike some of the others encountered here.
An interesting question is how far can Nutter stick his neck out for Hillary? If rumours are true and Obama got burned for backing Nutter's opponent, Nutter may not want to get in too deep himself. He's in a honeymoon period right now. He's probably getting a lot of feedback on his endorsement.