Media Bias in Covering Obama Climate Change Policy?

I understand why fossil-fuel-funded conservatives assert that climate change is "liberal." By why do the Associated Press and Washington Post fall into the label trap? Now even Rasmussen, a firm with a well-known conservative bias, found in a poll the day before the election that 68% of American voters see global warming as a "serious problem."

http://theenergycollective.com/josephromm/177621/washpost-and-ap-obama