To paraphrase Dennis Hopper, "there are only two ways that will happen -- no way and no how."
The left will never, ever, ever admit they were wrong. Some will call the tapes forgeries. Others will tortuously parse them, teasing out the most far-fetched interpretation that casts them in an "innocent" light. There is nothing Saddam could ever do or say, including frank admission of all our claims against him, that will ever convince the left that military action is justified. If Al Quaida nukes Chicago, the left will say, "See what you provoked?" If Al Quaida does not nuke Chicago, the left will say, "Obviously, there is no threat from Al Quaida."