Only a day after Senator Barack Obama delivered what some considered the greatest speech on the subject of race since Martin Luther King related one of his dreams, black voters in the keystone state have begun to abandon the presidential candidate.  Once considered (by somebody I think) the great black hope, his campaign now teeters on the brink of annihilation.  The trouble began with a stunning revelation mid-speech in which Obama admitted his grandmother was a white racist.  Reaction was swift and devastating.