An inquiring mind wants to know... is RR an echo chamber?

I have heard that it was once a conservative site. It is obviously a liberal site now; why is that? It's certainly not from banning opposing voices, as the last person banned was an obnoxious uber-Liberal. The one still shown in the penalty box was an incomprehensibly wacko insult machine - I don't think I ever grokked her political leanings. I don't recall anyone else being silenced in my now eight years here, though most of the conservatives have left.

I have been banned by numerous right-wing blogs (maybe 8?), though never for breaking the rules - they just can't stand being talked back to by anyone with supportable facts. Those are certainly echo chambers.

So I'll rephrase the question: Why is RR dominated by progressives/liberals?

You never change things by fighting the existing reality.
To change something, build a new model that makes the old model obsolete.
R. Buckminster Fuller