Gary Hart, United States Senator (Ret.), is the author of several books on foreign policy and national security policy. Lee H. Hamilton is director of the Woodrow Wilson International Center for Scholars in Washington, DC, and director of the Center on Congress at Indiana University. He served as a U.S. Representative from Indiana from 1965 to 1999. Philip H. Gordon is senior fellow for U.S. foreign policy at the Brookings Institution. He is an unpaid, outside foreign policy adviser to the Obama campaign, writing here in a personal capacity. His book Winning the Right War was recently published in paperback. Will Marshall is president of the Progressive Policy Institute, a Washington, DC, center for policy innovation.