I think that the case for libertarianism is becoming a bit more well respected in the philosophic community, although it is still a minority view. Certain major tenants of libertarianism are widely accepted (philosophical anarchism comes to mind) even if the position on the whole is rejected. The philosopher mentioned in this article (Michael Huemer), wrote a great book called The Problem of Political Authority which lays out a very good argument against the state in the first half and attempts to defend anarcho-capitalism in the second half.
While I don't think the second half of the book really succeeds in what it's trying to do, the arguments are well laid out and it's a good read regardless.
A bit of an aside, but I took a number of philosophy courses as an undergraduate (ended up minoring in it). While my professors stayed away from stating their own opinions on politics or religion - their teaching was effectively the Socratic method of "asking questions to separate the wheat from the chaff" - one notable exception to this was libertarianism.
Libertarianism is normally mocked because of actual libertarians. But yes it is not very popular in academia. I'd still say it's more popular among philosophers than in the rest of the humanities.
While I don't think the second half of the book really succeeds in what it's trying to do, the arguments are well laid out and it's a good read regardless.