FILE - In this Nov. 4, 20102 file photo, U.S. Sen. Mark Kirk, right, emerges from the 103rd floor stairwell at Chicago's Willis Tower during the RIC SkyRise Chicago event, a fundraiser

 

              FILE - In this Nov. 4, 20102 file photo, U.S. Sen. Mark Kirk, right, emerges from the 103rd floor stairwell at Chicago
FILE - In this Nov. 4, 20102 file photo, U.S. Sen. Mark Kirk, right, emerges from the 103rd floor stairwell at Chicago's Willis Tower during the RIC SkyRise Chicago event, a fundraiser for the Rehabilitation Institute of Chicago, where Kirk is a patient. Nearly a year after a stroke left him barely able to move the left side of his body, U.S. Sen. Mark Kirk is expected to climb the 45 steps to the Senate’s front door this week _ a walk that’s significant not just for Illinois’ junior senator, but also for medical researchers and hundreds of thousands of stroke patients. (AP Photo/Teresa Crawford, File)