One could argue /r/politics is an echo-chamber, too. I mean, it has been anti-Republican for a while, but at this point it's beyond absurd. All I see is Trump news. Like they hardly even talk about bad laws Republicans pass anymore. If it's not Trump-related, it's typically not upvoted/is downvoted.

I think it may be time for Reddit to experiment with removing the downvote button, or maybe give it 25% of the power it has now, or something along those lines.