I agreed with Nicholas when he said that the warrantless wiretapping scandal isn't the thing to run on, and I think the headline of this article -- "Feingold Wants Bush Censured for Spying" -- shows part of the reason why. The word "warrant" doesn't appear once in the entire text of the article, and the legal issues driving the case for censure are largely obscured.
The real problem isn't just that Bush was eavesdropping. Most people don't mind eavesdropping, if you follow the law and get a warrant. The real problem is that Bush was eavesdropping without following the law and getting a warrant. Illegal behavior of this kind is something that most people oppose. But since spying is much juicier than mere matters of legality, the media will pitch the debate as one about spying.
Perhaps a legal case for impeachment could be built out of the warrantless wiretapping scandal. But especially given the media coverage we're likely to get, other things are far more likely to move public opinion.
