From the Guardian:
So now we know what John McCain really thinks of his running mate Sarah Palin – and that's not just because of the awkward body language between them during his concession speech in Phoenix, Arizona.
An exasperated McCain has been telling friends in recent weeks that Palin is even more trouble than a pitbull.
In one joke doing the rounds, the Republican presidential candidate has been asking friends: what is the difference between Sarah Palin and a pitbull? The friendly canine eventually lets go, is the McCain punchline.