"What is Libertarian?" from The Institute for Humane Studies. Both of the major parties in the US could benefit from libertarian philosophy. Republicans could take their belief in economic freedom even further, not accepting federal funding of so many programs better left to private citizens, charities, businesses and state/local governments (little "r" republican).
Democrats could take their supposed belief in personal freedom beyond issues related to sexuality, abortion and sex changes cannot be the only things people can choose with their bodies. Why try to restrict what people eat, drink or ingest?