Sharon Irwin holds a sign during a prayer for Bella, a daughter of Republican presidential candidate and former Pennsylvania Sen. Rick Santorum, during a campaign rally in a hanger at Sarasota Bradenton International Airport in Sarasota, Fla., on Sunday, Jan. 29, 2012, where Mr. Santorum was scheduled to appear. He was staying home in Philadelphia to be with 3-year-old Isabella, who is hospitalized. (AP Photo/Paul Sancya)

Photo by: Paul Sancya

Sharon Irwin holds a sign during a prayer for Bella, a daughter of Republican presidential candidate and former Pennsylvania Sen. Rick Santorum, during a campaign rally in a hanger at Sarasota Bradenton International Airport in Sarasota, Fla., on Sunday, Jan. 29, 2012, where Mr. Santorum was scheduled to appear. He was staying home in Philadelphia to be with 3-year-old Isabella, who is hospitalized. (AP Photo/Paul Sancya)