Foreign Policy, a noted journal, has included an article outlining the case for the impeachment of George Bush.
It was written by a former member of Congress, Elizabeth Holtzman, who served during Watergate. She's sung this tune before, so perhaps she's simply on a crusade, but the argument deserves a listen.
Ultimately, she points out, an impeachment is a political decision, but he claims that the President has refuse to assent to the laws of Congress enough times to warrant removal from office.
Is she off base?