Former President George H.W. Bush pumps his fist next to his son, Jeb, during a fundraiser in Tampa, Fla., in 1994. Jeb Bush was running for governor. He lost that year, but won four years later. Chris O'Meara/AP hide caption

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Former President George W. Bush (right) and his father, former President George H.W. Bush, wave as they leave a family wedding in Washington, D.C., in May 2006. Normand Blouin-Pool/Getty Images hide caption

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Accepting the 2014 John F. Kennedy Profile in Courage Award on behalf of her grandfather former President George H.W. Bush, Lauren Bush Lauren, center, and fellow Award recipient Paul W. Bridges, the former mayor of Uvalda, Ga., right, hold the awards as they stand with Jack Schlossberg, left, grandson of President John F. Kennedy. Gretchen Ertl/AP hide caption

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Former President George H.W. Bush, former first lady Barbara Bush, right, and their newly wedded friends Helen Thorgalsen, center, and Bonnie Clement. Susan Biddle/AP hide caption

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President Obama, former presidents George W. Bush, Bill Clinton, George H.W. Bush and Jimmy Carter attend the opening ceremony of the George W. Bush Presidential Center on Thursday 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 photographs. Alex Wong/Getty Images hide caption

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