President Barack Obama laughs with former Presidents Jimmy Carter, Bill Clinton, and George W. Bush, prior to the dedication of the George W. Bush Presidential Library and Museum on the campus of Southern Methodist University in Dallas, Texas, April 25, 2013. (Official White House Photo by Pete Souza)   This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.