Listen to excerpts from a talk given in September by Kathleen Hall Jamieson, professor of communication at the Annenberg School for Communication and director of the Annenberg Public Policy Center at the University of Pennsylvania. Jamieson has written extensively on the press, politics and presidential campaigns. Her latest book is unSpun: Finding Facts in a World of Disinformation (Random House, 2007). Jamieson was the University of Oregon’s 2007 fall convocation speaker.