It's going to be difficult to impeach when you don't have Congress.
Even if by some freak accident the democrats took over the House and impeached the President, it is highly unlikely that they could garner 2/3 of the entire Senate to convict him.
If they keep the impeachment talk up it's gonna hurt them in November.
This will definitely backfire, especially since alot of them voted to support the war.
My gawd I really hope they try. If they do, the Dims can kiss '08 bye-bye, and probably '12 too.