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Founder of Americans for Tax Reform Grover Norquist participates in a debate at American Enterprise Institute in Washington, DC, November 29, 2011.

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Defense Secretary Robert Gates gestures while speaking at the American Enterprise Institute for Public Policy Research in Washington, Tuesday, May 24, 2011.

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WASHINGTON, DC - MAY 18: U.S. Sen. Patrick Toomey (R-PA) speaks at the American Enterprise Institute about the national debit May 18, 2011 in Washington, DC. Toomey delivered a speech which was billed as 'The Debt Limit and Correcting Our Unsustainable Fiscal Path.'

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Republican presidential candidate Herman Cain talks about taxes while at the American Enterprise Institute in Washington, October 31, 2011.

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WASHINGTON, DC - OCTOBER 31: Republican presidential candidate and former Godfather's Pizza chief executive Herman Cain (L) participates in a discussion with American Enterprise Institute Senior Fellow and Director of Economic Policy Studies Kevin Hassett about Cain's 9-9-9 tax plan...

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WASHINGTON, DC - OCTOBER 31: Republican presidential candidate and former Godfather's Pizza chief executive Herman Cain participates in a discussion about his 9-9-9 tax plan at the American Enterprise Institute October 31, 2011 in Washington, DC. POLITICO.com reported Sunday that the...

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Republican presidential candidate, Herman Cain, walks off stage after answering question on his tax plan at the American Enterprise Institute for Public Policy Research (AEI) in Washington, Monday, Oct. , 31, 2011. Also on stage is Kevin A. Hassett, right, Senior Fellow and Director of...

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Republican presidential candidate, Herman Cain answers question on his tax plan at the American Enterprise Institute for Public Policy Research (AEI) in Washington, Monday, Oct. , 31, 2011.

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A packed room listens to Republican presidential candidate, Herman Cain, on video screen, speaks at the American Enterprise Institute for Public Policy Research (AEI) in Washington, Monday, Oct. , 31, 2011.

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FILE - In this Oct. 31, 2011, file photo Republican presidential candidate Herman Cain speaks at the American Enterprise Institute for Public Policy Research (AEI) in Washington. Cain does not shy away from using race as a talking point, much to the consternation of liberal and...

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Republican presidential candidate, Herman Cain arrives to speak at the American Enterprise Institute for Public Policy Research (AEI) in Washington, Monday, Oct. , 31, 2011.

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WASHINGTON - SEPTEMBER 15: (L-R) Paul Atkins, former commissioner at the Securities and Exchange Commission and visiting scholar at the American Enterprise Institute, Stephen Crimmins, partner at K&L Gates LLP, Jonathan 'Jack' Katz, a former secretary of the Securities and Exchange...

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WASHINGTON - SEPTEMBER 15: Paul Atkins, former commissioner at the Securities and Exchange Commission and visiting scholar at the American Enterprise Institute, testifies at a hearing on Capitol Hill on September 15, 2011 in Washington, DC. The hearing focused on recent legislative...

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Taiwan opposition presidential candidate, Dr. Tsai Ing-wen, chairwoman of the pro-independence Democratic Progressive Party, speaks at the American Enterprise Institute in Washington, DC, September 13, 2011, on the first day of a 9-day trip to the US to promote US-Taiwan relations.

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A protester dressed as a Guantanamo prisoner demonstrates outside the American Enterprise Institute in Washington, DC, on September 9, 2011 as former US Vice President Dick Cheney participates in a discussion on the 9/11 attacks.

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Former US Vice President Dick Cheney participates in a discussion on the 9/11 attacks at the American Enterprise Institute in Washington, DC, on September 9, 2011. Cheney spoke about his experience working in the White House, as well as the terrorist attacks of September 11, 2001 as the...

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Desmond Lachman, Resident Fellow at the American Enterprise Institute for Public Policy Research, speaks at the Council on Foreign Relations World Economic Update in New York March 16, 2011.

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Republican presidential hopefuls take part in the Republican presidential debate on national security November 22, 2011 at the Daughters of the American Revolution (DAR) Constitution Hall in Washington, DC. From left are: Former Pennsylvania senator Rick Santorum; Texas Rep. Ron Paul;...

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Texas Gov. Rick Perry (R) chats with Texas Rep. Ron Paul at the conclusion of the Republican presidential debate on national security November 22, 2011 at the Daughters of the American Revolution (DAR) Constitution Hall in Washington, DC. The debate is hosted by CNN in partnership with...

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Minnesota Rep. Michele Bachmann (C) speaks as former Utah governor Jon Huntsman (R) and former house speaker Newt Gingrich (L) liten during the Republican presidential debate on national security November 22, 2011 at the Daughters of the American Revolution (DAR) Constitution Hall in...

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Former House speaker and GOP presidential hopeful Newt Gingrich chats with fellow contender Minnesota Rep. Michele Bachmann (R) at the conclusion of the Republican presidential debate on national security November 22, 2011 at the Daughters of the American Revolution (DAR) Constitution...

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Former House speaker and GOP presidential hopeful Newt Gingrich gestures to CNN moderator Wolf Blitzer at the conclusion of the Republican presidential debate on national security November 22, 2011 at the Daughters of the American Revolution (DAR) Constitution Hall in Washington, DC. ...

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US businessman Herman Cain (R) listen as former Massachusetts governor Mitt Romney (L) makes a point during the Republican presidential debate on national security November 22, 2011 at the Daughters of the American Revolution (DAR) Constitution Hall in Washington, DC. The debate is...

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Minnesota Rep. and GOP presidential hopeful Michele Bachmann speaks during the Republican presidential debate on national security November 22, 2011 at the Daughters of the American Revolution (DAR) Constitution Hall in Washington, DC. The debate is hosted by CNN in partnership with the...

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Texas Rep. Ron Paul (L) and Texas Governor Rick Perry (R) arrive on stage prior to the start of the Republican presidential debate on national security November 22, 2011 at the Daughters of the American Revolution (DAR) Constitution Hall in Washington, DC. The debate is hosted by CNN in...