They're almost ubiquitously unknown.
> they have lax moderation
I refer to the boards ideological content, not its own governance, although there are arguments to be made that informal, social governance employs Patriarchal tropes to keep users in line.
> so long as we are discussing American politics
We're not. We're discussing an international propagandist forum.
> I don't think those alternate conceptions are relevant. Clinton is clearly further left than Trump.
The USA has never had a "Leftist" administration in any meaningful sense.
Edit: your attitude strikes me as suspiciously apologetic on behalf of an atrocious, violent reactionary movement. If this is due to naivete, I hope the previous ly cited texts can alleviate it. If this is due to your own Patriarchal reactionary bent, we're done; I've no reason to spar with a dishonest partner.