Santo has delegate problems all over the US. Voting for him will be useless if he can't get the delegates to back his votes.
The delegates go to the one who takes second in the district. Therefore Santorum could win Illinois by 60% and Romney will still win the delegate battle there.
Santorum will likely have to challenge the delegate count at the convention, as well as Florida’s and Virgina’s allocation (attempt to disallow VA’s delegation). Romney will automatically win those delegates from the districts where Santorum did not qualify if Romney takes second there.
Sigh. I wish someone would have said something about Santorum’s delegate troubles before. /s