He always had a liberal bias. Always. Sometimes he came off like middle of the road, or slightly conservative - he was aware that a large part of his audience didn't hold his views on the world at large. I would get sent links to his stuff (i.e. he's on our side), or see links on some conservative sites, like here, but always felt like he was trying to sell a bill of goods - a subtle argument to consider the possibilities. He probably listens to PBS "All Things Considered", which really is All Things Liberal.