Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left, shakes hands with U.S. Rep. Paul Ryan, R-Wis., Chairman of the House Budget Committee, right, before speaking with supporters of Wisconsin Republican Gov. Scott Walker at a phone bank during a campaign stop in Fitchburg, Wis., Saturday, March 31, 2012. The phone bank is used in support of Walker who is facing a recall election in June 2012. (AP Photo/Steven Senne)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left, shakes hands with U.S. Rep. Paul Ryan, R-Wis., Chairman of the House Budget Committee, right, before speaking with supporters of Wisconsin Republican Gov. Scott Walker at a phone bank during a campaign stop in Fitchburg, Wis., Saturday, March 31, 2012.  The phone bank is used in support of Walker who is facing a recall election in June 2012. (AP Photo/Steven Senne)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left, shakes hands with U.S. Rep. Paul Ryan, R-Wis., Chairman of the House Budget Committee, right, before speaking with supporters of Wisconsin Republican Gov. Scott Walker at a phone bank during a campaign stop in Fitchburg, Wis., Saturday, March 31, 2012. The phone bank is used in support of Walker who is facing a recall election in June 2012. (AP Photo/Steven Senne)
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