Two great thinkers discuss liberalism, intellectual blindness and the dangers facing democracy today. Mario Vargas Llosa, Peruvian writer and 2010 Nobel Prizewinner, promotes liberal thought and pays tribute to seven authors who embrace it, in The Call of the Tribe. He talks to Michael Ignatieff, rector and president of Central European University in Budapest, author of The Ordinary Virtues: Moral Order in a Divided World.