** FILE ** Former Presidents George H.W. Bush and George W. Bush wave as they drive off the field before an NFL football game abetween the Houston Texans and the Oakland Raiders Sunday, Nov. 17, 2013, in Houston. (AP Photo/Morry Gash)

Photo by: Morry Gash

** FILE ** Former Presidents George H.W. Bush and George W. Bush wave as they drive off the field before an NFL football game abetween the Houston Texans and the Oakland Raiders Sunday, Nov. 17, 2013, in Houston. (AP Photo/Morry Gash)