I think it is a combination of low hanging fruit and a realization that Cheney is probably responsible for a lot of the missteps. People don't think Bush is all that smart and they believe he is easily manipulated by people around him (Rove and Cheney).
This probably isn't going to go anywhere past the first couple of stages of the impeachment before it is tabled or removed. And if it does get serious it will be come highly partisan and then stall.
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