** 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)

Photo by: Tony Gutierrez

** 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)