In May 21, 2009 file photos President Barack Obama, left, delivers an address on national security, terrorism, and the closing of Guantanamo Bay prison, Thursday, May 21, 2009, at the National Archives in Washington. Former Vice President Dick Cheney speaks at the American Enterprise Institute in Washington, Thursday, May 21, 2009. The speeches conveying two radically different views of America's fight against terrorism and the nation's values unfolded in separate halls, minutes apart. (AP Photo)
Republican presidential candidate Herman Cain leaves the stage after speaking about his tax plan at the American Enterprise Institute in Washington on Monday, Oct., 31, 2011. At right is Kevin A. Hassett, senior fellow and director of economic policy studies at AEI. (AP Photo/Pablo Martinez Monsivais)
Defense Secretary Robert M. Gates speaks at the American Enterprise Institute for Public Policy Research in Washington on Tuesday, May 24, 2011. "I am determined that we not repeat the mistakes of the past, where budget targets were met mostly by taking a percentage off the top," he said. (Associated Press)
Defense Secretary Robert M. Gates speaks at the American Enterprise Institute for Public Policy Research in Washington on Tuesday, May 24, 2011. (AP Photo/Alex Brandon)
New Jersey Gov. Chris Christie speaks at the American Enterprise Institute in Washington on Wednesday, Feb. 16, 2011. (AP Photo/Evan Vucci)
Treasury Secretary Timothy Geithner, second from left, hosts a Conference on the Future of Housing Finance, Tuesday, Aug. 17, 2010, at the Treasury Department in Washington. From left are, National Urban League President and CEO Marc Morial, Geithner, Ingrid Gould Ellen of New York University, and Alex Pollock of the American Enterprise Institute. (AP Photo/Pablo Martinez Monsivais)
Treasury Secretary Timothy Geithner, second from left, hosts a Conference on the Future of Housing Finance, Tuesday, Aug. 17, 2010, at the Treasury Department in Washington. From left are National Urban League President and CEO Marc Morial, Mr. Geithner, Ingrid Gould Ellen of New York University, and Alex Pollock of the American Enterprise Institute. (AP Photo/Pablo Martinez Monsivais)
Treasury Secretary Timothy Geithner puts down his notes as he hosted the Conference on the Future of Housing Finance, Tuesday, Aug. 17, 2010, at the Treasury Department in Washington,. Sitting behind Geithner is Alex Pollock from the American Enterprise Institute. (AP Photo/Pablo Martinez Monsivais)
