Republican presidential candidate Sen. Rick Santorum listens to his wife, Karen, as he is introduced during the Cape County Republican Women's Lincoln Day Dinner on Saturday in Cape Giradeau, Mo. He won the Kansas caucuses Saturday. (Associated Press)

Republican presidential candidate Sen. Rick Santorum listens to his wife, Karen, as he is introduced during the Cape County Republican Women's Lincoln Day Dinner on Saturday in Cape Giradeau, Mo. He won the Kansas caucuses Saturday. (Associated Press)