However, I suppose it is up to many people in the GOP if they want to award this one to Romney as well by continuing to split the Conservative vote, or not, and have the RINO as the standard bearer of the Party, not to mention a moderate platform, and the whole thing come to a crashing defeat in November.
The result of what you advocate could be Romney at 49-51% and Santorum at 36-38% in Illinois based on multi-state polling which asked about a three-way race with Romney-Santorum-Paul only.
North Carolina is 31-27-20 (M-S-N), if Newt got out the most favorable expected split puts Mitt at 40, Santorum at 38. Santorum loses.
Alabama? Santorum is third, 34-28-33 (M-S-N), no Newt? Santorum loses 48-46.
If he's not within 2-3% of Romney on his own, he would lose even assuming the highest polled percentage, 57%, broke his way.
The way to stop Romney, if that's your aim, is for everyone to stay in and block him from an outright win.