So what happens when some investigation turns up serious criminal activity from a Republican member of congress? Or several? I can see a situation where the incumbency protection racket kicks in (if you want to know what this is, ask Ned Lamont) and a deal is struck for impeachment brought by Republicans. The Democrats would remain unstained, and Republicans have serious issues with Bushco right now. Would we be left with "full steam ahead" Darth Cheney? Could they get them both? President Pelosi?
I think Bush has more to fear from Republicans right now than subpoena wielding Democrats. The mantra of "Conservatism cannot fail, people can only fail conservatism," is being heralded far and wide. Run this through my oil filter and it sounds like "failures cannot be conservatives." Look for Bush to continue to plummet in the polls as his last, die hard thirty per centers continue to bail. It might be better not to impeach him. All the dirty laundry is fixing to come out--a jacket of many colors should be fashioned for him to wear--he is the albatross of the Republican party--their titular head and the embodiment of all that is conservative.
Let us never forget.