Since I posted that it has become clear that I was wrong and over-estimated the Democratic response. I’m sure some of that was for the reasons you suggest.
Heck, I kinda hope the Democrats DO try to impeach the President. It will at least keep them busy and less inclined to mess about in OUR business for the next 16 months. It would also distract them, and thus make it harder for them to sabotage the Iraq war efforts.