I'd vote for him if I wasn't living in a swing state at that point in my life.
To clarify, from what I've read on this elsewhere, I don't think anyone knows whether he'd run as a Republican or a Libertarian. He may decide to go the GOP route, just because the GOP primary debates give you lots of free exposure (as with Ron Paul in 2008).
Ah, I was assuming he was going to run for the Libertarian nomination. If he runs in the Republican Primary I'd vote for him if I lived in a state with open primaries.