When the Soviet Union dissolved, the triumph of liberal democracy seemed so complete that some historians declared the moment "the end of history." Three decades later, history is continuing apace, the liberal world order is on life support and many historians consider the fight to sustain democracy this century's preeminent political challenge. In the fourth show of season, Common Ground will discuss the life and death battle between autocracy and democracy and the future of constitutional government both in America and around the world. Guests: Christiane Amanpour, Senator Mitt Romney, Senator Cory Booker, Mike Morrell, Anne Applebaum, Chris Wallace, George Packard, David Frum.