I've read and enjoyed a lot of sf novels from Orson, who is a devout Mormon, BTW, last I heard. His "Enders Game" is classic for kids or adults, and the series that follows has a lot to recommend it, as well. Altogether a thoughtful and thought provoking author, who enjoys taking on really challenging moral and philosophical issues and does a really good job, generally, in presenting them. (And, I speak as a devout atheist and follower of Ayn Rand.)
I suspect, however, re "liberal bias," that the reality is more diverse. I occasionally cruise the local radio dial just to see who's out there, and it's a real zoo here in the LA/OC area. One thing that has gone largely unremarked by the media is the rise of the ultra-right "Patriots" on the low-budget AM circuit. These are direct descendents of the old John Birchers, with their Bilderbergers and Illuminati/Council on Foreign Relations schtick, and their typical holocaust denials, etc.
The interesting thing is that if you look at their publications, or listen to them for very long, you find that on a wide variety of issues, they are precisely in line ideologically with the radical progressive left. In fact, many of their published articles could be dropped right into some progressive/left inner city rabble rouser journal and wouldn't raise a ripple. It's absolutely the same line, verbatum. And it's really embarrassing to the leftists when I hand them an issue of one of the Patriot rags, open to a select article, watch them eat it up, and then show them the "Protocols of the Elders of Zion" nonsense, or the magnetized water that will cure AIDS, on the following page.
So, where does THAT fit in this dialogue? Does it discredit the left? Or the "Patriot" right? Has one of them been somehow subverted by the other? Or have both groups been sucked into a bodacious conspiracy?