Rand Paul is not a Libertarian... his dad may be, though I'd consider him more of a Constitutionalist. Back when the tea party started, there were a lot of Libertarians attached to the project, mostly those disillusioned with no progress, but most of those who would consider themselves hard core Libertarians have since left it to the religious nuts (while still reserving the right to agree with some of what they are against in economic matters)