Former Vice President Dick Cheney wears a hat and sunglasses at the dedication of the George W. Bush Presidential Library on the campus of Southern Methodist University in Dallas on Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

Photo by: Charles Dharapak

Former Vice President Dick Cheney wears a hat and sunglasses at the dedication of the George W. Bush Presidential Library on the campus of Southern Methodist University in Dallas on Thursday, April 25, 2013. (AP Photo/Charles Dharapak)