A lot of us see your same view and agree with you, but Santorum is much too full of himself and too selfish to “fold up his tent” in order to stop Romney, while he still thinks he’s in the race to stop both Romney and Gingrich.
THAT fanciful thinking alone should give serious pause to his supporters.
Santorum used up his lucky shot when he won his first election in PA. It was about as close to a political miracle as anything you’ll likely see anytime soon. He is trying to the exact same thing again and it isn’t working. If the lightning strikes him again, it is more likely to electrocute him than elect him.