That McCain has gone back and forth on a lot of his “maverick” stances is common knowledge, but seeing him contradict himself so blatantly really drives the point home:
Robert Greenwald and his crew have put together a site called therealmccain.com to highlight these sorts of things (there are too many to call them “slip ups,” I should think, unless McCain has dementia). This is a good one for your Republican friends who think McCain is a “straight shooter” (as I used to).