Former president George H.W. Bush, left, applauds with Laura Bush after former president George W. Bush's speech during the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
Former president George H.W. Bush, left, applauds with Laura Bush after former president George W. Bush's speech during the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
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)
From left, First Lady Michelle Obama, former first lady Laura Bush, former first lady Hillary Clinton, former first lady Barbara Bush, former first lady Rosalynn Carter arrive for the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
From left, First Lady Michelle Obama, former first lady Laura Bush, former first lady Hillary Clinton, former first lady Barbara Bush and former first lady Rosalynn Carter arrive for the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
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)
From left, former first lady Barbara Bush, President George H.W. Bush, former president George W. Bush and former first lady Laura Bush holds hands during the invocationduring the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
Former President George H.W. Bush and former president George W. Bush and his wife Laura Bush laugh while former president William J. Clinton speaks during the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
From left, President George H.W. Bush, former president George W. Bush and Laura Bush listen to former president William J. Clinton during the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
