Republicans don't.
This sums it up pretty nicely. Ron Paul's positions include:
You see more Ron Paul signs at OWS & Code Pink rallys than at Tea Party rallys.
Ron Paul is a capital-L libertarian. The vast majority of Tea Partiers are Reagan-conservatives.
It would behove us to make a list of differences between capital-L Libertarians and Reagan-conservatives.
Now is not the time for a Libertarian like Ron Paul—He’s in the wrong Party—his act may play well in parts of Texas but it will not work nationally. Only a handful of the GOP would back him.
I have two words for you: John McCain