The Libertarians should have someone on the ticket -- don't know who though.
No one worth considering. Michael Badnarik managed to get on the ballot in most states but I'd be surprised if he pulls more than .5% of the total popular vote.
The party lists him as a "Constitutional scholar" but I've yet to find anything that indicates he's ever taken so much as one law class. The LP Bio on him says his knowledge came from "self-study" and one press release claimed he had "taught law" for 3 years but no one seems to be able to figure out where. Maybe in his living room?