Former Sen. Rick Santorum of Pennsylvania, a Republican presidential candidate, chats with schoolchildren after speaking to backers inside the First Baptist Church of Okeechobee's gymnasium in Okeechobee, Fla., on Tuesday. Some values voters with big families are supporting Mr. Santorum. (Associated Press)

Former Sen. Rick Santorum of Pennsylvania, a Republican presidential candidate, chats with schoolchildren after speaking to backers inside the First Baptist Church of Okeechobee's gymnasium in Okeechobee, Fla., on Tuesday. Some values voters with big families are supporting Mr. Santorum. (Associated Press)