FILE - In this Oct. 11, 2010 file photo, Illinois Republican U.S. 

FILE - In this Oct. 11, 2010 file photo, Illinois Republican U.S. Senate candidate Rep. Mark Kirk laughs during the annual Coumbus Day parade in Chicago. 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 is significant not just for Illinois' junior senator, but also for medical researchers and hundreds of thousands of stroke patients. (AP Photo/M. Spencer Green, File)
Associated Press
FILE - In this Oct. 11, 2010 file photo, Illinois Republican U.S. Senate candidate Rep. Mark Kirk laughs during the annual Coumbus Day parade in Chicago. 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 is significant not just for Illinois' junior senator, but also for medical researchers and hundreds of thousands of stroke patients. (AP Photo/M. Spencer Green, File)
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