This David Frum op-ed in the New York Times does a good job explaining the divisions between the different conservative factions (though there are still full-spectrum conservatives out there). At the root is what Tim Carney has dubbed the Dougherty Doctrine, after Michael Brendan Dougherty: "At the end of the day, the arguments all seem to boil down to something similar: If it were more like me, the Republican Party would be better off. It's failing because it's like you."
MORE: Peggy Noonan's column on the conservative civil wars, along with her take on the audacity of Bill Clinton, is worth a read as well.