I think New York state has one too.
My point is that libertarians don't have to have their own parties. In fact the difference between libertarians and conservatives (Goldwater and Reagan, not neocon, or theocons) are very small. The republican parties ever expanding government is a real danger, if the conservatives and libertarians get together and make a third party it would effectively move the republicans to a minority party.
The republican party is made up of different factions, which have a modest amount in common with each other. The problem is the national party isn't interested in getting done what they all have in common.