I know that this has been blogged and linked to before. Not new, but worth repeating, William Saletans summary of republican hypocrisy from Slate.
Some Democrats call Republicans who make these arguments unpatriotic. Republicans reply that they're serving their country by debunking and thwarting a bad policy administered by a bad president. You can be sure of only two things: Each party is arguing exactly the opposite of what it argued the last time a Republican president led the nation into war, and exactly the opposite of what it will argue next time.