If a group of users come together and upvote content they individually agree with, is it "an agenda", or is it "consensus"?

Unless I missed something, there's nothing inherent in /r/politics that requires it to be a dispassionate collection of links that represent all sides of the political spectrum. Don't get me wrong, it's a pit of human misery that I've long since removed from my subreddit list, but it's what users want it to be.