Heinlein and his proteges, Niven and Pournelle, are definitely libertarian/conservatives, though they may not have much tolerance for so called conservative twits like Pat Buchannen or Ross Perot. If you want to know who Heinlein was read Stranger in a Strange Land and study the character Jubal Harshaw. Definitely a libertarian. Pournelle was one of Reagans science advisors and helped come up with some of the better ideas for SDI, including some that Rumsfeld is bringing back.
Niven, Pournelle and Michael Flynn wrote a book called Fallen Angels that skewers as many liberal icons as they could possibly think of. Among other things it is the ultimate answer to global warming and Al Gore (Global Warming is real and it's the only thing keeping the ice age at bay, so if Al Gore and his greenies were to ever take over we'd be knee deep in glaciers inside of 20 years). One of the things they point out is that Science Fiction is largely for conservatives and fantasy is largely for liberals (greenies).
Baen books, one of the better "science fiction should be fun" publishing houses is full of conservative/libertarian authors, particularly John Ringo. A lot of their stuff is available for free as ebooks in their free library. They don't do it out of the goodness of their hearts. They tell you flat out that they're hoping you'll enjoy the stories they've released and decide to buy the rest of the author's books to continue reading the series. Ringo's Legacy of the Alldenata series is priceless for military types (he was Airborne and an Army brat and it shows). The line that compels most people to read the books when I tell them about it is "that's what you get for letting red necks paly with anti-matter." You HAVE TO read a book with a line like that in it.
And then their's Rick Cook's (some also free on Baen) Wiz series. There are three or four basic fantasy plots. Most lend themselves to liberal plot lines. Cook is an IEEE fellow and a computer geek from way back. He chose fantasy plot number 2: someone falls through a hole in reality and ends up in a place where magic works. The difference is that his hero, a computer wizard, finds out that he can write a magic compiler. For those in the business it is priceless. All of the jokes are computer jokes (geeks will love the "user interface" in book 2, Wizardry Compled) and i swear I was at the party at Comdex in book 5.
Rick Cook is the perfect SF/Fantasy author to address this question. Not an obvious liberal or conservative, but clearly a free thinker. His Wiz Zimualt would reject equally doctrinaire rantings from the left or the right, but I bet he'd enjoy FR. In fact, if you hang out here, Rick, I'd love you to Freepmail me. I want to see Wiz and Moira just one more time. I think I have a plot for you.....
Fallen Angels - read it. BTW, I'm a LASFS member although I haven't been to a meeting in ages.
Hey, howya doin? I was going to ping you on this thread when I got home, but I see you made it.