President George W. Bush’s increasingly erratic behavior and wide mood swings has the halls of the West Wing buzzing lately as aides privately express growing concern over their leader’s state of mind. In meetings with top aides and administration officials, the President goes from quoting the Bible in one breath to obscene tantrums against the media, Democrats and others that he classifies as “enemies of the state.” Worried White House aides paint a portrait of a man on the edge, increasingly wary of those who disagree with him and paranoid of a public that no longer trusts his policies in...