Republican presidential nominee Mitt Romney, center, thanks Louisiana Army National Guardsmen for their efforts in the aftermath of Hurricane Isaac Aug. 31, 2012, in Lafitte, La. Isaac developed as a tropical storm over the Western Atlantic Ocean Aug. 21, 2012, affecting Puerto Rico, the Dominican Republic, Haiti and Cuba before making landfall as a hurricane on the Gulf Coast of the United States. (U.S. Air Force photo by Master Sgt. Toby M. Valadie/Released)