Were the superdelegates to nominate Hillary Clinton, despite Barack Obama gaining a plurality among the pledged delegates, they would run the risk of alienating black voters in November.
But what exactly would that mean? In how many states do black voters make the difference? I ran some rough numbers over at Robert Emmet -- check them out. Depending on how much of a drop-off you assume, it could cost the Democrats 10 to 76 electoral votes.