I never said Miers was going to be a star.
I understand Dean sold out Nixon and it is unlikely that Miers will consciously do the same to Bush. But all the Democrats need is the opportunity and the soapbox. The media will take care of the rest.
If she doesn't answer their questions then she'll be accused of "stonewalling" by the press. The fact that it was ever a confirmation hearing will go completely out the window as the Democrats and the media turn it into a trial for the Bush administration.