U.S. Senator Mark Kirk (R-IL), right, who participated in a clinical walking trial at the Rehabilitation Institute of Chicago following a massive stroke in January 2012, arrives for his walk up the Capitol building steps in Washington on Thursday, January 3, 2013. Kirk hopes his recovery will serve as an inspiration to the millions of Americans recovering from stroke. (Paul Morigi / AP Images for Rehabilitation Institute of Chicago)

Associated Press
U.S. Senator Mark Kirk (R-IL), right, who participated in a clinical walking trial at the Rehabilitation Institute of Chicago following a massive stroke in January 2012, arrives for his walk up the Capitol building steps in Washington on Thursday, January 3, 2013.  Kirk hopes his recovery will serve as an inspiration to the millions of Americans recovering from stroke.  (Paul Morigi / AP Images for Rehabilitation Institute of Chicago)
U.S. Senator Mark Kirk (R-IL), right, who participated in a clinical walking trial at the Rehabilitation Institute of Chicago following a massive stroke in January 2012, arrives for his walk up the Capitol building steps in Washington on Thursday, January 3, 2013. Kirk hopes his recovery will serve as an inspiration to the millions of Americans recovering from stroke. (Paul Morigi / AP Images for Rehabilitation Institute of Chicago)
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