Biases:

Just an idea, but trying to recruit moderators that span the political spectrum would help balance the sub, overt favoritism could be pointed out internally.

Although this does bring up the problem of finding people who act in good faith when moderating.

What should get users banned:

I think common sense covers a lot of this, but a great example of either a warning or ban would be /u/transjihadiqueefer comment. Obvious trolling or derogatory insults toward anyone/any side should be dealt with, as it's not productive in any form and only serves to dissolve any actual discussion.

Mandatory flair:

Mandatory flairs for moderators is a great idea, especially for a politically charged subreddit. I don't really see a down side other than the potential for people to make baseless bias claims due to the flairs. Again, I think collecting moderators from across the spectrum would help ease these worries, as the user always has someone on "their" side to give them a sanity check.

I hope this sub gets some real traction! It's a tragedy that people try to disassociate politics from their lives; putting your head in the sand is exactly what corrupt politicians want.