George W. Bush

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Former President George W. Bush rode with 14 veterans during the third annual Warrior 100K ride this past weekend through rough terrain near Waco, Texas. (George W. Bush Institute)

President Obama stands with former presidents George W. Bush, Bill Clinton, George H.W. Bush, and Jimmy Carter at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

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** FILE ** Former President George W. Bush speaks as President Obama listens during the dedication of the George W. Bush Presidential Center on Thursday, April 25, 2013, in Dallas. (AP Photo/Tony Gutierrez, Pool)

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President Barack Obama and first lady Michelle Obama stand with former Presidents George W. Bush, George H.W. Bush, and their wives, former first ladies Barbara Bush, and Laura Bush amd bow their heads in prayer at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

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Former Vice President Dick Cheney, center, shakes hands with former British Prime Minister Tony Blair during the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. Former President George W. Bush's daughter Jenna Bush Hager is at right. (AP Photo/Charles Dharapak)

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President Barack Obama stands with former presidents, from second from left, George W. Bush, Bill Clinton, George H.W. Bush, and Jimmy Carter at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

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President Barack Obama, and former presidents, from second from left, George W. Bush, Bill Clinton, George H.W. Bush and Jimmy Carter arrive for the dedication of the George W. Bush Presidential Center ,Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)

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President Barack Obama stands with first lady Michelle Obama, former first lady Barbara Bush, former President George W. Bush, and Laura Bush at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

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From left, former British Prime Minister Tony Blair, former Secretary of State Condoleezza Rice, former Vice President Dick Cheney, and former President George W. Bush's daughter Jenna Bush Hager, participate in the singing of "God Bless America" at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)