At this point, if Hillary somehow manages to secure the nomination, virtually every African American in the United States is going to be screaming that once they finally had a viable candidate, he got cheated. The fallout for the Democratic party will be catastrophic.
I love it when a plan comes together.
They could minimize the damage by having Hillary and Obama make the announcement jointly. Obama could talk about all the stuff he'll do in his powerful new post in the Clinton administration and remind folks that he'll be perfectly groomed for the top job in 8 years. Hillary can sweeten the pot by offering to triple taxes on the rich and triple benefits to the "underprivileged".