In "The Art of War," Sun Tzu, the Chinese general and military strategist, wrote, "Know your enemy and know yourself, find naught in fear for 100 battles. Know yourself but not your enemy, find level of loss and victory. Know thy enemy but not yourself, wallow in defeat every time." In "The Tea Party Challenge: Understanding the Threat Posed by the Socialist Coalition," Kevin Groenhagen argues that the socialists who now control the Democratic Party...