There's a decent amount in the middle, but it's not as well known and will never hit the front page - 3 second memes are easier to process and upvote.

https://www.reddit.com/r/NeutralPolitics/

https://www.reddit.com/r/PoliticalDiscussion/

CMV and ELI5 also have decent political discussion at times I think; askHistorians often seems to provide insight into current political issues; there's probably more I don't know.