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I suspect BushCo is going to drag this all the way to the Supreme Court. They won't let Condi or Karle Rove testify under oath, and the Catch 22 is that Congress can't prosecute them for crimes if they won't testify under oath.
I think Congress is angry enough to take it to the limit, but they need to keep hearing from constituents. Once it gets to the Supreme Court, who knows what will happen - a less conservative court appointed Bush president in the first place. Will the new court give them the pass of executive privilege?