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IMAGE DISTRIBUTED FOR REHABILITATION INSTITUTE OF CHICAGO - U.S. Senator Mark Kirk (R-IL), second from left, who participated in a clinical walking trial at the Rehabilitation Institute of Chicago following a massive stroke in January 2012, is greeted by U.S. Vice President Joe Biden, left, while Senators Joe Manchin (D-WV), center, and Dick Durbin (D-IL), right, walk with him up the Capitol steps in Washington on Thursday, Jan. 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
IMAGE DISTRIBUTED FOR REHABILITATION INSTITUTE OF CHICAGO - U.S. Senator Mark Kirk (R-IL), second from left, who participated in a clinical walking trial at the Rehabilitation Institute of Chicago following a massive stroke in January 2012, is greeted by U.S. Vice President Joe Biden, left, while Senators Joe Manchin (D-WV), center, and Dick Durbin (D-IL), right, walk with him up the Capitol steps in Washington on Thursday, Jan. 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)
IMAGE DISTRIBUTED FOR REHABILITATION INSTITUTE OF CHICAGO - U.S. Senator Mark Kirk (R-IL), second from left, who participated in a clinical walking trial at the Rehabilitation Institute of Chicago following a massive stroke in January 2012, is greeted by U.S. Vice President Joe Biden, left, while Senators Joe Manchin (D-WV), center, and Dick Durbin (D-IL), right, walk with him up the Capitol steps in Washington on Thursday, Jan. 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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