If it quacks like a republican, caucuses with republicans and usually runs for office as a republican, then it's a republican. Libertarian is the same thing as republican. 
For more info, see Paul, Ron; Paul, Rand. 

Libertarians give a lot of gratuitous chatter about the stupidity and futility of the drug war but they never, ever make any effort or work with like-minded liberals to make an issue of it. They claim they are for abortion rights but they never work with Democrats to fight the ongoing republican war on choice. Libertarian voters almost always vote republican in the absence of a "libertarian" candidate...and let's face it...rarely is there a registered Libertarian running in most races. 

Libertarian was, is and always has been another name for republican.