Part of political correctness is "racial intimidation". Some minorities will try to intimidate whites by accusing them of some sort of racially biased thinking or actions, the biggie being "A Black man can't be President in AmerKKKA. He'll be shot right away!"
The Liberal white dufus's, who still thinks it's 1865, response is supposed to be along the lines of "Oh no, I'm not racist. See, I'm voting for Barack Obama! See, I'm not a racist". Racial manipulation by intimidation.
The question "Is America ready for a Black President?" is also a form of intimidation.