Endorsing a libertarian for president seems to be a contradictory statement, if it implies that a libertarian tries to run for president.
I mean, ok, there is a loophole in beliefs so to say, that non-libertarian politics may not be just or obligatory or possess that legal sacredness non-libertarians attribute them, but participating in those is not contradictory to being a libertarian. Even running for president still calling yourself a libertarian.
I suppose in USA the last pic is true. In Russia libertarians are mostly teenagers and adults of teenager mentality, and also the only real category of lone gloomy types not interested in activism and such.