and there are many rifts - here are a few:

The religious right vs. libertarians - what role does religion play in government? Abortion rights, drugs.

Reagan Republicans vs. business Republicans - NAFTA and other free trade laws, how much to do about illegal immigration.

The general rift of who controls conservative thought - the establishment types, the religious types or the various radicals (anti-tax, those against illegal immigration, etc.)

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"This day I shall have to do with an idle curious vain man, with an unthankful man, with a talkative railer, a crafty, false or an envious man. An unsociable sarcastic man. A greedy man. A deceiver. Such is the way of the world, and I shall be no more affected by it than I am about changes in the weather." - Marcus Aurelius (translation from Latin by Jacob A. Stein)