If they do, they won't be able to hide their true colors and then the American people can see how despicable they truly are and can vote them out en masse during Giuliani's landslide victory in 2008.
I see your point (count on Dims to over play their hand), but there would be two years of non-stop hearings and investigations, with a sympathetic media providing round the clock saturation coverage. Dems would not be able to accomplish much legislatively, but they could make lots of noise.
How so? The House can cut off all spending for Iraq and spend 2 years on Impeachment proceedings. That would be a disaster.
They could also add all kinds of Liberal ideas to spending bills, but that's the kind of nonsense that would benefit the GOP in the long run.
It's amazing how many people forget simple military maxims. (Churchill: "Wars are not won by evacuations.")