Nikki Haley’s feigning of staggering ignorance about the cause of the US civil war unintentionally revealed her quandary in the Republican party. It was not a gaffe. Though it was a stumble, it was not a mistake, but a message she has delivered for years and that has served her well until now. Her carefully crafted and closely memorized garble was a deracinated version of an old lie, which she had used before to attempt to mollify hostile camps in order to skid by. Some in the past praised her evasive formula as governor of South Carolina as her finest...