Here is some information to chew on. From the poll.
Santorum is now completely dominating with several key segments of the electorate, especially the most right leaning parts of the party. With those describing themselves as ‘very conservative,’ he’s now winning a majority of voters at 53% to 20% for Gingrich and 15% for Romney. Santorum gets a majority with Tea Party voters as well at 51% to 24% for Gingrich and 12% for Romney. And with Evangelicals he falls just short of a majority with 45% to 21% for Gingrich and 18% for Romney.