“Pyrrhic Victory” Mitt.
If it is five votes for Santorum over Romney, it will be a "PHOTO FINISH TO A DRAW" (in other words, they will not proclaim who won, and if they don't get the same number of votes exactly their intrinsically as to be a "winner".)
If it is five votes for Romney over Santorum, it will be "Romney Narrowly Wins", or "Romney Wins", or "Romney Tops Iowa Caucuses" or some such other bullsh*t. Take it to the bank.