US catholics are culturally more or less protestant in their norms and values so my point still stands. You want real catholics look at latin america or at western Europe(for examples of actual lapsed catholics 
).
If anything, Latin American Catholics are even more conservative. Abortion and gay marriage, for example, are not even part of the political conciousness in many Latin American nations. Wstern Europe is an entirely different matter, of course.
Northern mexican conservatism is I believe more economic than social so I'm not entirely sure the current GOP strategy of focusing on social issues('All White jesus all the time!') is going to help there.
I do not claim to be a expert on Mexican politics so I'm going out on a limb here, but the PAN is a Christian Democratic party rather than a conservative one in the American sense. As I understand it, Christian Democrats are much more populistic economically and skeptical of classical liberalism then it "hurts the poor" (reminds me somewhat of the Huckabee wing of the GOP). In fact, the Wikipedia article (not a reliable source, I know, but still) puts a lot more emphasis on the social conservatism of the PAN than on their economic policy.
I'm agnostic but have noticed that catholics are significantly less prone to fundamentalism(in the modern era) than catholics.
Assuming you meant to type than Protestants, certainly not in rural Latin America...
