Have Obama supporters caused the Democratic parties divisions this election?

I disagree with that I think that Hillary thought that she could win it on name reconition alone and I agree with you on the part of blacks voting for Obama because he's black but the whole thing has proven as least one thing to me ,it seem to me that black votes count more for a white person than they do for a black ,because Hillary feels that she can win without the black vote but Obama can't win without whites ,