Santorum campaigns in Missouri as caucuses begin

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum talks to supporters during a rally Saturday, March 10, 2012, in Springfield, Mo. (AP Photo/Charlie Riedel)

March 17, 2012 10:16:35 AM PDT
Rick Santorum was mining suburban St. Louis for last minute support Saturday, as Missouri Republicans began gathering in local caucuses that will help determine who gets the state's 52 presidential delegates that are up for grabs.