I was thinking the same thing. Or "not all gay people are fags" or "no, I'm talking about bull-dykes, not lesbians...
Since Obama supporters are not a historically oppressed group, it's not really comparable but for one thing - it allows people to use offensive words and engage in group smearing.
It's just weak-minded cover when you know you're shooting your mouth off but can't control yourself.
I see that KnowVox is back, and in fine ratings-abuse form.