I think the idea is supposed to be that, if you find yourself thinking of an accomplished politician and intellectual as being noteworthy for their mere articulate-ness (as opposed to, say, eloquence), you were not expecting much of them. And if you only find yourself thinking this way of the black intellectual politicians, then maybe you're not as unracist as you thought.

*shrug* It's probably impossible to become colorblind if one wasn't already. The most people ever seem to accomplish is to correct for it, sometimes over- and sometimes under-.