A presidential Thanksgiving past: President George W. Bush prepares to serve dinner to U.S. troops in Baghdad after paying a surprise Thanksgiving Day visit  to Iraq in 2003. (AP Photo/Pablo Martinez Monsivais)

A presidential Thanksgiving past: President George W. Bush prepares to serve dinner to U.S. troops in Baghdad after paying a surprise Thanksgiving Day visit to Iraq in 2003. (AP Photo/Pablo Martinez Monsivais)