I wouldn't rule out the possibility of Santorum getting the Republican nomination, but I wouldn't mind too much. It would practically seal a Democratic victory in the general election.
The only states that Rick Santorum would probably carry if he is the Rebublican nominee in 2016 are Texas, Alabama, Mississippi, South Carolina, Idaho, Utah, Wyoming, Kansas, Nebraska and maybe Ohio or Iowa depending on the state of the economy. More Republicans will be moving to support marriage equality.
Rick Santorum may as well be campaigning on another planet. He's done.
Those states you mentioned. Eliminate Ohio, due to its bellwether status, and Iowa, which also produces margins close to the national number, and the best scenario in the general-election fantasy of Santorum-the-GOP-nominee rests with the
Red States Which Don't Care. Alabama. Mississippi. Utah. Wyoming. Idaho. Oklahoma. (
Enough!)