My theory: the Bush people have no intention of airing this ad. They're just trying to sucker the media into pitching a hissy fit, and when it does (as it is doing, along with the Kerry campaign), the GWB people will point out that they were just replaying parts of the MoveOn ad. They're doing a judo move here, one that will redirect people's attention to the MoveOn ad and the over-the-top rhetoric of the Democrats and their surrogates.
Interesting theory. In other words, use this strawman as a way in which to get free publicity to get the word out that the dems are so extreme they are comparing Bush to Hitler. If they aren't doing it with this ad, I think this idea you've mentioned is a great one and could be used over and over.