The reasons I vote for Republicans:
* Tax cuts.
* Competence in foreign policy and national security matters (there is the cocasional screw-up, like blacklisting the AUC - note to Secretary Powell: When somebody is putting the hurt on narco-terrorists like FARC, the correct response is schadenfreude, NOT blacklisting the guys who are putting the hurt on FARC).
* In general, an aversion to burdensome regulations when compared to the Democrats (they need to repeal the ephedra ban).
* Much more often than not, good judges.
That said, it would be very hard for me to be voting for someone like Tom Tancredo. I'd strongly consider other options.
Just because they're druglords and have a penchant for dismembering poor peasants alive with chainsaws doesn't mean the US Government shouldn't be denying them support...(/sarc)