It's not just conservative sites that Google is killing, there're also many non-political sites that are severely affected like The Online Slang Dictionary. The whole ugly story is here:

http://onlineslangdictionary.com/pages/google-panda-penalty/

QRD: Google nearly killed The Online Slang Dictionary, which actually is a damn good resource for slang definitions. Google's manual and automated algorithms didn't like the dictionary's Wikipedia-style citations that showed actual usage of a term. Attempts to delete ads and redact citations ultimately had no effect on changing the search rankings. No remedy available.