Republican presidential candidate, former Massachusetts Gov. Mitt Romney and his wife Ann wave as they leave at an election night event in Schaumburg, Ill., Tuesday, March 20, 2012. Romney won the Illinois Primary. (AP Photo/Nam Y. Huh)

Photo by: Nam Y. Huh

Republican presidential candidate, former Massachusetts Gov. Mitt Romney and his wife Ann wave as they leave at an election night event in Schaumburg, Ill., Tuesday, March 20, 2012. Romney won the Illinois Primary. (AP Photo/Nam Y. Huh)