Maybe? But it sure didn't seem like he had a leftist agenda to push. And Carlson specifically has used populist messages in the past to further the alt-right mindset in his viewers in really disturbing ways, so I don't know what benefit Greenwald saw in going on that particular show. Carlson really is like, the worst mainstream media content producer. It just seems like a net loss for any agenda other than making Greenwald feel better.