President Barack Obama salutes before greeting Illinois Gov. Pat Quinn left, as he walks off Air Force One after landing at O'Hare International Airport in Chicago, Wednesday, April 2, 2014. (AP Photo/Paul Beaty)
President Barack Obama arrives at Chicago O'Hare International Airport on Air Force One, Wednesday, April 2, 2014, in Chicago, as he travels to attend Democratic National Committee (DNC) events. (AP Photo/Carolyn Kaster)