The truth is while Ron Paul is not going to be the nominee, he'll still win a significant share of support in primaries.
Outside of Iowa, what's his "significant" support? He polls at like 8%. Yeah, it's more than Santorum. Big deal.
The guy is one of the most overestimated people in all of politics. He has an insanely, dangerously obsessed loyal crew while the other 90% of the party hates him.
Oh yes, he is badly overestimated by his out-of-reality fandom. Yet, as a protest candidate, he performed pretty well in 2008 for someone who's totally unelectable (both for nomination and general election), and certainly will perform better in 2012. When compared to support for Paul, Santorum simply doesn't exist.