What they are hoping for now is that they can propose to exit Iraq, but not get it through Congress. Then assuming the war continues to go badly, they can use the fact that they tried to leave Iraq in the 2008 election without having to face up to the nasty consequences of a cut & run.
Well there is a good possibility that they will make the proposal and it won't go through. However, there maybe enough RINOs to ensure that it does. Guess this is one area Chaffee could have come in handy.