Limbaugh has evidently abandoned every principle he claimed to have in the early 90's.
I think Maher is a good guy to have in your libertarian corner. His audience isn't the choir.
I wish P.J. O'Rourke had more to say, he is very popular as a writer overseas. I haven't heard his opinion on Ron Paul yet. He is very pro-military, but otherwise has been quite libertarian for a while.
Interesting about O'Rourke.
A quick internet search shows that O'Rourke apparently has little respect for Paul. Then again, I can't remember him showing respect for anyone.