I don't think you need to be much concerned. When it comes to the politics of individual LessWrong posters I genuinely prefer not to know, but overall as a demographic LessWrong is pretty "social democratic" in its political beliefs.

To quote Konkvistador's summary:

• liberalism 34.5% (376)
• libertarianism 32.3% (352)
• socialism 26.6% at (290)
• conservatism 2.8% (30)
• communism 0.5% (5)

I think you can agree your fear is quote unfounded. Considering most of the Libertarians are probably left Libertarian and our very wide spread dislike for the religious right in the US, LessWrong if anything is likley to have a strong left wing bias.