But earlier in the contest, the loudest voice promoting the former Pennsylvania senator wasn't the candidate himself. It was Foster Friess, a multimillionaire who was the main funder of a pro-Santorum superPAC.
After months of upsets and indecisive results, there were signs this week that the battle for the 2012 Republican presidential nomination may be entering its final stages. Mitt Romney has a huge lead in delegates, and some big endorsements are rolling in. Host Scott Simon talks with NPR's Don Gonyea in Wisconsin, which has a primary Tuesday.