It is safe to say that to a liberal NO BLACK PERSON can be credible. To liberals all of them are Uncle Toms, House Ni66ers, and worse.
Facts don't bother them.
Like the fact that the President of the Republican Party is an African American.
The fact that Bush had more African Americans in key position in his cabinet than Obama.
The fact that white Democrat head honchoes time and time again opposed Blacks getting into higher positions. Most current example being Obama butting his ever-growing nose into New York State politics and opposing the running for Governor the current black Governor.
The fact that it was a Republican that freed the black slaves. But never mind, that's ancient history.
The fact that it is white Republicans who want to release black kids from the modern day slavery of undereducation, provided by the Teachers Union, by using school vouchers, so all kids can enjoy education that kids of rich blacks, like Obama do.
The fact that one of their spokesman, Robert Byrd is a Grand Wizard of the Ku Klu Klan.
Could go on, but what for. Monolithic vote, by definition, implies monolithic stupidity.