Members of Congress line the steps to the Senate door of the Capitol building on Capitol Hill in Washington, Thursday, Jan. 3, 2013, as Sen.  Mark Kirk, R-Ill., second from right, accompanied by Sen. Joe Manchin, D-W.Va., right, and Vice President Joe Biden, waves as he walks the steps to mark his return to Congress. Kirk said he often visualized climbing the 45 steps of the U.S. Capitol as a source of inspiration during his months of grueling physical therapy after suffering a major stroke last year.  (AP Photo/ Evan Vucci)

Photo by: Evan Vucci

Members of Congress line the steps to the Senate door of the Capitol building on Capitol Hill in Washington, Thursday, Jan. 3, 2013, as Sen. Mark Kirk, R-Ill., second from right, accompanied by Sen. Joe Manchin, D-W.Va., right, and Vice President Joe Biden, waves as he walks the steps to mark his return to Congress. Kirk said he often visualized climbing the 45 steps of the U.S. Capitol as a source of inspiration during his months of grueling physical therapy after suffering a major stroke last year. (AP Photo/ Evan Vucci)