Not the hardcore democrat votes, but definitely some moderates and a LOT of independents.
This is why I keep saying that I believe Cain has the best shot at beating Obama. He is the only candidate I know that has this widespread appeal - he appeals to the far right conservatives (like me :-) but because of his fiscal conservativism and non-politician, common sense approach, independents like him. His American success story inspires some democrats - like Juan Williams. The only group that seems to be in for him is the ultra-RINO-establishment but even some of them are coming around, I think.
I feel very optimistic about his chances.
I should add..
Everything I wrote above, I think the opposition sees, which is why the all out attack on him.