John McCain is an old fart

I've been head down in deadlines this week so I'm just now catching up on some of the news. And am just now processing the idea of Senator John McCain saying that he didn't think Susan Rice, our ambassador to the UN was "very bright."  It's way too easy to go, "John, really? Compared to who?" but honest to God, has he even seen her Wikipedia entry? This woman has been over-achieving since she was a kid and she's only 48 now, which in terms of a political career is just getting started. What on earth could have persuaded the man who picked Sarah Palin as his running mate to gratuitously slam a woman so accomplished? Is it sexism, racism, or just plain cluelessness?