EDIT: @dang in another comment: Let me clarify. The main concern here is pure politics: the conflicts around party, ideology, nation, race, and religion that get people hot and turn into flamewars on the internet. We're not so concerned about stories on other things that happen to have political aspects—like, say, software patents.
A challenge that's come up around lots of controversies is the way that one side might think something is "political", while another side thinks it's not!