A supporter holds a sign autographed by U.S. Republican presidential candidate Mitt Romney after he attended a phone bank on behalf of Wisconsin Gov. Scott Walker in Fitchburg

 
A supporter holds a sign autographed by U.S. Republican presidential candidate Mitt Romney after he attended a phone bank on behalf of Wisconsin Gov. Scott Walker in Fitchburg
A supporter holds a sign autographed by U.S. Republican presidential candidate Mitt Romney after he attended a phone bank on behalf of Wisconsin Gov. Scott Walker in Fitchburg, Wisconsin, March 31, 2012. REUTERS/Darren Hauck (UNITED STATES - Tags: POLITICS ELECTIONS)