Shilliary actually does well with the african american voters — its how she trounced Bernie in the south. And in the last few election cycles, married caucasian women vote republican almost as frequently as white males (no matter their marital status) do. Democrats do own the minority and single women’s votes though and at least in 2008, owned the youth vote, too.
My thought was that without a black person running, blacks are not going to make the effort to vote.
In CA some homo legislation was voted down because black people, notoriously anti-homo, came out in droves to vote for Barack and the homo legislation was on the ticket at the same time.