It's not going to be Huntsman (people still hadn't forgiven him for agreeing to be Obama's ambassador to China, which strongly limits his ability to run further right than where he ran OTL).
It's never going to be Paul; he appeals to a specific subset of the Republican Party. They can be very passionate (which lets them do ok in caucus states), but cap out at 10-15% in actual primaries. That's a hard ceiling, and not one he can breach.
Most likely, someone else jumps in to represent the establishment. Maybe Perry manages to remember all three departments he wants to eliminate. Maybe one of the miscellaneous governors/senators who were speculated about decides to go for it (remember Haley Barbour?). It's not impossible Santorum or Gingrich ends up winning if nobody plausible jumps in. Either of those two would be crushed in a landslide in the general, however.
It's never going to be Paul; he appeals to a specific subset of the Republican Party. They can be very passionate (which lets them do ok in caucus states), but cap out at 10-15% in actual primaries. That's a hard ceiling, and not one he can breach.
Most likely, someone else jumps in to represent the establishment. Maybe Perry manages to remember all three departments he wants to eliminate. Maybe one of the miscellaneous governors/senators who were speculated about decides to go for it (remember Haley Barbour?). It's not impossible Santorum or Gingrich ends up winning if nobody plausible jumps in. Either of those two would be crushed in a landslide in the general, however.