Iraq Opposes U.S. Presence; Kanan Makiya; Brian Greene

President of ABC News David Westin, managing editor of Time Magazine Jim Kelly, and journalists Bob Woodruff, David Wright, and Terry McCarthy report on escalating opposition to American presence in Iraq. Advisor to the Iraqi Governing Council Kanan Makiya adds his perspective to the conversation about the reporting being done on Iraq and what should be done by the U.S. Brian Greene, a professor of physics and mathematics at Columbia University, and author of "The Elegant Universe," explains the basics of string theory.