IMAGE DISTRIBUTED FOR REHABILITATION INSTITUTE OF CHICAGO - George Hornby, Ph.D., research scientist at the Rehabilitation Institute of Chicago and lead researcher on a clinical walking trial in which U.S. Senator Mark Kirk (R-IL) participated in after suffering from a massive stroke in January 2012, fields questions from reporters during a press conference after Sen. Kirk climbed the Capitol building steps in Washington on Thursday, Jan. 3, 2013, marking his comeback to Senate. (Paul Morigi / AP Images for Rehabilitation Institute of Chicago)

Associated Press
IMAGE DISTRIBUTED FOR REHABILITATION INSTITUTE OF CHICAGO - George Hornby, Ph.D., research scientist at the Rehabilitation Institute of Chicago and lead researcher on a clinical walking trial in which U.S. Senator Mark Kirk (R-IL) participated in after suffering from a massive stroke in January 2012, fields questions from reporters during a press conference after Sen. Kirk climbed the Capitol building steps in Washington on Thursday, Jan. 3, 2013, marking his comeback to Senate. (Paul Morigi / AP Images for Rehabilitation Institute of Chicago)
IMAGE DISTRIBUTED FOR REHABILITATION INSTITUTE OF CHICAGO - George Hornby, Ph.D., research scientist at the Rehabilitation Institute of Chicago and lead researcher on a clinical walking trial in which U.S. Senator Mark Kirk (R-IL) participated in after suffering from a massive stroke in January 2012, fields questions from reporters during a press conference after Sen. Kirk climbed the Capitol building steps in Washington on Thursday, Jan. 3, 2013, marking his comeback to Senate. (Paul Morigi / AP Images for Rehabilitation Institute of Chicago)
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