Mitt Romney is rightly being hit for his flip-flop on immigration. However, Fred Thompson's "tough" stance isn't exactly enough to make him the restrictionists' hero, either. As recently as 2006, Mr. Thompson clearly stated that some sort of legalization — or "amnesty" — would be necessary. He seems to be for a virtual border fence (like President Bush) instead of a brick-and-mortar one. And he doesn't want tough sanctions for employers. This all puts Mr. Thompson roughly in line with Rudy Giuliani. On a path to citizenship: "[B]ecause we allowed ourselves to wait until we woke up one day and...