DALLAS, TX - APRIL 25: (L-R) U.S. President Barack Obama, former President George W. Bush, and former President Bill Clinton attend the opening ceremony of the George W. Bush Presidential Center April 25, 2013 in Dallas, Texas. The Bush library, which is located on the campus of Southern Methodist University, with more than 70 million pages of paper records, 43,000 artifacts, 200 million emails and four million digital photographs, will be opened to the public on May 1, 2013. The library is the 13th presidential library in the National Archives and Records Administration system. (Photo by Alex Wong/Getty Images)
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