McCain seems to be doing the same thing. From his hypocritical statements about Obama regarding his associations (when he has the same ones, or worse) to the whole Letterman fiasco - all the contradictions are played out on various news channels. They really seem to have no idea that they can be disputed by simply running a tape.
As for Palin, she seems to only answer in rehearsed speeches that don't really make any sense. A favorite funny man - in Monty Python, various movies, and hilarious writings - John Cleese states it quite well: