McCain vs. McCain
I stumbled across this, so if someone finds the same thing for Obama point me to it so that I can give both candidates equal time in the debate... the debate vs. themselves.
And yes, I know that it is easy to snip things out of context, though in a lot of these it's obvious that he's contradicting himself. There's nothing wrong with changing your mind on an issue, just be upfront and don't try to play it both ways. Again, I'm sure there are examples of Obama doing the same thing.