I don't have a favorite amendment. I also value our unenumerated rights equally. The fact that Barr does have a favorite suggests a limited understanding of the concept of rights, and a less-than-Libertarian viewpoint. Then again, as the Libertarian candidate, one could say he defines the term "Libertarian," as least as it applies to the formerly-Libertarian party.
With that said, I might vote for the guy. Definitely a better choice than McCain or Obama.