Ron Paul on the campaign trail

Rep. Ron Paul addresses the Conservative Political Action Conference at the Marriott Wardman Park February 11, 2011 in Washington. The longtime Texas governor and staunch libertarian is making a serious bid for the 2012 Republican presidential nomination.

Paul, left, and Rick Santorum at the GOP presidential candidate debate in Arizona on CNN on February 22, 2012.

Rep. Ron Paul, R-Texas, speaks to his supporters following his loss in the Maine caucus to Mitt Romney Feb. 11, 2012, in Portland, Maine. — AP Photo

Paul speaks to his supporters following his loss in the Maine caucus to Mitt Romney Feb. 11, 2012, in Portland, Maine.

Paul speaks to supporters at the Student Union Building in Moscow, Idaho, on Friday, Feb. 17, 2012.

Paul delivers a speech in Henderson, Nevada after the polls closed on primary election day in Florida. Paul did not compete seriously in the winner-takes-all state.

Paul greets supporters and signs autographs during a whistle-stop tour at the Grand Strand Airport in North Myrtle Beach, S.C. on Friday Jan. 20, 2012.

Paul and his wife Carol Paul wave to supporters at his primary night campaign rally on January 10, 2012 in Manchester, New Hampshire. Paul finished second behind former Massachusetts Gov. Mitt Romney in the first in the nation primary.

Screen_shot_2011-12-29_at_2.14.55_PM.png — C-SPAN.org

Paul discusses controversial newsletters published in his name in an interview with WHO-AM's Jan Mickelson, December 29, 2011.

Paul and his wife Carol Paul look on during a rally on the night of the Iowa caucus at the Courtyard Des Moines Ankeny on January 3, 2012 in Ankeny, Iowa. According to early results U.S. Rep. Ron Paul (R-TX) came in third in the Iowa GOP caucus behind former Massachusetts Gov. Mitt Romney and former U.S. Sen. Rick Santorum, who were neck and neck.

Paul laughs as he sits down with Elizabeth Rose Chamberlain, 3, of Epping, N.H., while campaigning at the Early Bird Cafe in Plaistow, N.H., Tuesday Dec. 20, 2011.

Texas Gov. Rick Perry speaks as Paul looks on during a debate hosted by CNBC and the Michigan Republican Party at Oakland University on November 9, 2011 in Rochester, Michigan.

Paul takes questions from attendees to a town hall meeting at the Governor's Inn, Friday, Nov. 11, 2011 in Rochester, N.H.

Paul talks to PBS Nightly Business Report Co-Anchor and Managing Editor Tom Hudson (L) during a forum on manufacturing November 1, 2011 at Vermeer Manufacturing in Pella, Iowa.

Paul speaks to a gathering of conservative Christians at the Iowa Faith & Freedom Coalition Presidential Forum on October 22, 2011 in Des Moines, Iowa.

Paul speaks during a luncheon at the National Press Club on October 5, 2011 in Washington. Paul was addressing those in attendance on his strategies to deal with many of the nation's problems.

Paul autographs a sign after speaking to students at the University of New Hampshire's Manchester campus, Oct. 3, 2011, in Manchester, N.H.

The crowd cheers as a surrogate for Rep. Ron Paul speaks during the Republican Party's Florida Presidency 5 convention at the Orange County Convention Center on September 24, 2011 in Orlando, Florida.

Paul speaks during the California Republican Party Convention on September 16, 2011 in Los Angeles, California.

Paul speaks at the Iowa Straw Poll, which was held at Iowa State University, August 13, 2011 in Ames, Iowa.

Paul of Texas breaks from campaigning for president to ride a bike in Concord, N.H.

Senator Rand Paul, R-Ky., listens to his father, Ron Paul, at a campaign stop on August 10, 2011 in Cedar Rapids, Iowa.

Paul announces to supporters that he's forming a campaign exploratory committee, as he decides whether or not to seek the Republican nomination for president, on April 26, 2011 at the airport Holiday Inn in Des Moines, Iowa. At 75-years-old, this was his third announcement for a presidential run since his first bid in 1988.

Paul speaks as Rep. Michael Burgess (R-TX) (L) and Rep. Kevin Brady (R-TX) (R) listen during a hearing before the Joint Economic Committee on Capitol Hill October 22, 2009 in Washington.

Former New York City Mayor Rudy Giuliani (R) speaks with Paul before the first Republican Candidates' debate of the 2008 Presidential Race, at the Reagan Presidential Library in Simi Valley, California, May 3, 2007.

Paul talks with reporters in the media center after addressing the Americans for Prosperity's "Defending the American Dream" Summit, October 5, 2007 at the Mayflower Hotel in Washington, DC.

Paul visits the Broadway at the Beach shopping center during a campaign stop January 10, 2008 in Myrtle Beach, South Carolina.

Committee Chairman Rep. Barney Frank (D-MA) (R) talks with Paul before testimony by U.S. Federal Reserve Chairman Ben Bernanke to the House Financial Services Committee on 'Unwinding Emergency Federal Reserve Liquidity Programs and Implications for Economic Recovery,' March 25, 2010 in Washington.

Rep. Walter Jones (R-NC), Rep. Dennis Kucinich (D-OH) and Paul attend a news conference to announce bipartisan legislation calling on President George W. Bush to set a plan for beginning phase-out of U.S. troops in Iraq on Capitol Hill June 16, 2005 in Washington, DC.