If you're talking about the "old Republicans" who may pretend right now that they are also libertarians (like Glenn Beck is doing for example), then I agree. But since the "Ron Paul movement" a lot of true libertarian people entered the Republican party and are still trying to take over it. The "real" Republicans are actually fighting them, though, because besides lower taxes they have almost nothing in common.

Also if you were thinking about Rand Paul, in a way he's his father's son, and unlike others who just pay lip service for liberty and such, he's actually fought hard against the Patriot Act, FISA, NDAA, drones and so on. He filibustered them for many hours, introduced amendments (which obviously got rejected), etc. However, he also seems to play way too much towards the overly religious base in the Republican party, and in that way he's also much like the "old" Republicans, which is a shame, and I think it makes even libertarians have second thoughts about him. The "always lower taxes" attitude at least could work on most libertarians, but the very religious side of him, kind of ruins it for libertarians, too.