Former Pennsylvania Sen. Rick Santorum speaks during the Cape County Republican Women's Lincoln Day Dinner, Saturday, March 10, 2012, in Cape Giradeau, Mo. Rick Santorum won the Kansas caucuses in a rout on Saturday and Republican presidential front-runner Mitt Romney countered in Wyoming, a weekend prelude to suddenly pivotal Southern primary showdowns in the week ahead. (AP Photo/Eric Gay)

Former Pennsylvania Sen. Rick Santorum speaks during the Cape County Republican Women's Lincoln Day Dinner, Saturday, March 10, 2012, in Cape Giradeau, Mo. Rick Santorum won the Kansas caucuses in a rout on Saturday and Republican presidential front-runner Mitt Romney countered in Wyoming, a weekend prelude to suddenly pivotal Southern primary showdowns in the week ahead. (AP Photo/Eric Gay)