Republican presidential candidate Rick Perry said that evolution was “just a theory” and that it had “some gaps in it.” Paul Krugman thinks that Republicans are dumb, knuckle-dragging Neanderthals. In the not-too-distant future he sees a Republican half-wit delivering his acceptance speech as presidential nominee at the convention in grunts, beating his chest, and bopping his wife over the head with the a club as he drags her on to the stage by her hair. Writing in The New York Times, Krugman says, “One of these years the world’s greatest nation will find itself ruled by a party that is...