The growing tendency of late for liberals and conservatives to regard each other as not just opponents, but enemies, has been one of the most alarming in an alarming era. At the root of this fear and loathing is mutual incomprehension: Liberals simply don't understand conservatives, and vice versa. In years past, the historical profession has done little to improve matters. Liberal historians typically treated conservatives and their ideas with disdain, when they deigned to notice them at all.