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, wears pink socks as he is seated in a wheelchair with, from left, first lady Michelle Obama, President Barack Obama, former first lady Barbara Bush, and former President George W. 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)
President Barack Obama laughs as he sits between his wife, first lady Michelle Obama and former first lady Barbara Bush after his speech during the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
Barbara Bush, right, wipes her eye as former President George W. Bush speaks at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. Also pictured left to right: former Secretary of State Condoleezza Rice, former Vice President Dick Cheney, daughter Jenna Bush Hager, and husband Henry Hager(AP Photo/Charles Dharapak)
President Barack Obama speaks during the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. Seated, from left are, former first lady Barbara Bush, former President George H.W. Bush, former President George W. Bush, and his wife, former first lady Laura Bush. (AP Photo/Charles Dharapak)
