Is George Bush a Flip-Flopper?

Okay, we all know that George Bush doesn't read, so I don't mean that he reads iFlipFlop. But for a guy who made a presidential campaign joke out of John Kerry's "flip-flopping," it's all the more ironic to hear him saying "I said 'Stay the course' but what I meant was 'Adapt and win.'" Who is the going to be the one to call George Bush a flip-flopper? And why haven't they?

UPDATE: I saw this DNC ad on Oliver's site.