Obama's repeated references to his racial identity (add. here), as he has made to his largely black audiences, and his surrogates' accusations that his political opponents, first Hillary and now McCain, are racist, will sink Obama's candidacy as surely as Reverend Wright. The parroting of their attitudes and allegations, by the MSM supporters of Obama, only open further Obama's vulnerability. His candidacy is based on his pledge of post-racial politics. That pledge means, see no racism, hear no racism, speak no racism. If center, mainstream voters suspect that his race-neutral posture is fake, they will conclude he is a trickster, and he will not win the election. Period.
Update. August 1, 2008. Obama is hinting that African Americans should receive reparations for slavery and to compensate for the injuries of segregation. Reparations would further alienate America's white, centrist voters. Further, an honest debate over reparations for slavery would be truly ugly. The Left has been talking to itself, where honest opinions that reparations to blacks would be ethically wrong have not been voiced. The debate between collective justice and individual justice would surprise and upset black America. Such a debate would set black-white relations back by a generation. The only black politicians to be elected after that would be from heavily black districts. The "post-race" era would be over. Reparations is an issue where Obama is not showing leadership for the nation.
Update. August 3, 2008. Obama says that he opposes reparations that are direct payments to the descendents of slaves; but favors "reparations" for all African Americans in the form of betters schools and jobs.