I've been reading the posts in answer to the original question which was actually: Is Science Fiction Getting More Conservative?
That's another question entirely. I'd say that SFF is always going to be a product of its time and place of origin. Certainly the authors mentioned in the reply posts like Harry Harrison and PK Dick were not as Conservative as the four authors contacted for their opinion, but then those four authors do not form a representative sample either.
Also, if the USA is more Conservative politically today, then it stands to reason that authors with Conservative views would be more popular. Whereas in the UK we are more Socialist and we get Iain M Banks' Culture
Edit: Oh! And if you read the China Mieville interview right here at Chronicles, he says he is a Marxist. China Mieville Interview