The Republican primary is actually turning into a microcosm of the party's various wings, with some social/cultural overlaps in the last two categories.
Santorum: Social Conservatives
Romney: Country Club Republicans
Paul: Libertarians
Gingrich: Angry White Men (Even if he's not necessarily getting their votes)
Basically in the 1970's, the Social Conservatives and the Republican Establishment made a deal. Despite the South and its social/cultural brethern's claims to only resent and hate the industrial titans of Wall Street and the North, on some level they're deeply jealous of them and feel an aspiration and hope to someday become them. In return for the Country Club Republicans giving the Social Conservatives something to aspire to, the Social Conservatives have their vote, albeit Carter and Clinton were able to steal some of them away as they temporarily presented more aspirational models against Ford and Bush/Dole. With Romney, the Social Conservatives are not entirely convinced that they have someone they want to aspire to being, which isn't necessarily anything new, but all of a sudden Santorum has provided them with a clear alternative.
The Libertarians/Angry White Men have differences in several areas, but are united in the sense that they are more opportunistic Republicans, supporting the party more because they hate Liberals and Democrats then because they love the party itself. They have many of the same social and cultural resentments as more traditional Social Conservatives do, but come to them in a different way. AWM's religiosity varies from state to state and in fairly irreligious parts of the country, someone like Ron Paul is able to get both Libertarians/AWM on his side, while in the religious South they remain more traditionally Socially Conservative and Newt has done a better job in peeling some of them away for himself
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My bracket wasn't good enough to beat SuperNiceDog's in the GameFAQS Rivalry Rumble. Congrats!
This is Yesmar.