President Barack Obama, followed by Sen Bob Casey, D-Pa., walks from Marine One to board Air Force One at the171st Air Refueling Wing Pennsylvania Air National Guard, Wednesday, Jan. 29, 2014, in Coraopolis, Pa., en route to Washington after speaking at the U.S. Steel Irvin Plant, in West Mifflin, Pa., about retirement policies he highlighted in the State of the Union address. (AP Photo/Carolyn Kaster)

President Barack Obama, followed by Sen Bob Casey, D-Pa., walks from Marine One to board Air Force One at the171st Air Refueling Wing Pennsylvania Air National Guard, Wednesday, Jan. 29, 2014, in Coraopolis, Pa., en route to Washington after speaking at the U.S. Steel Irvin Plant, in West Mifflin, Pa., about retirement policies he highlighted in the State of the Union address. (AP Photo/Carolyn Kaster)