To the editor: "Whenever the nation is under attack, from within or without, liberals side with the enemy," writes Ann Coulter in her new book, "Treason," subtitled "Liberal Treachery from the Cold War to the War on Terrorists." Wrong. Our nation is presently "under attack from within" by the group known as PNAC, the "Project for the New American Century,"[1] which now inhabits the Bush White House. Liberals are certainly not siding with this enemy. The progressive movement desperately is attempting to defend the U.S. constitution from this menace. Desperate because the White House and both houses of Congress have...