The White House is seen Sunday, Nov. 12, 2000, in Washington. The nation continues to wait to find out if it will be Democrat Al Gore or Republican George W. Bush that will next reside at 1600 Pennsylvania Avenue. (AP Photo/Robert F. Bukaty)
** FILE ** President Barack Obama listens as former President George W. Bush speaks during the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/Tony Gutierrez, Pool)
The White House is seen Sunday, Nov. 12, 2000, in Washington. The nation continues to wait to find out if it will be Democrat Al Gore or Republican George W. Bush that will next reside at 1600 Pennsylvania Avenue. (AP Photo/Robert F. Bukaty)
President Barack Obama listens as former President George W. Bush speaks during the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/Tony Gutierrez, Pool)
President Barack Obama listens as former President George W. Bush speaks during the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/Tony Gutierrez, Pool)
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)
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)
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)
