Sarah Palin sets the tone for a narrow, spiteful corner of American politics. That corner was occupied by the Tea Party convention last week in Nashville, where Palin served up a strong, carefully-brewed, neo-con-written speech featuring a blend of slurs steeped in personal animus toward Barack Obama. There were lies of a general nature, including the palm-reading Palin’s suggestion that the President is so out of his depth, so stupid—at least that’s what the cheering crowd heard—that he can’t function without a teleprompter. And the contradictory, but equally bogus, claim that Obama is a feeble egghead -- appealing to an...