The war over immigration reform among conservatives continues, and, as in most wars, truth has been one of the first casualties. Those who disagree with the hardening positions of people who would adopt more restrictive policies or with people who favor less restrictive measures are attacked as know-nothings, traitors or handmaidens of evil forces out to destroy the America we live in. Many conservatives reacted angrily to the way the Bush administration tried to demonize opposition to the president’s quasi-amnesty and guest-worker proposals when they were first introduced. Critics at the time were characterized as racists or “nativists” more interested...