WikiLeaks stories are upvoted around here because (I suspect) they reflect the massive social changes that the internet is enabling, which the HN community is clearly interested in.
Anonymous, WikiLeaks, et al represent the changing power dynamic in society globally, and that's fascinating to a lot of us (especially considering it generally involves people with a hacker mindset).
I'd agree with flagging a real political story (like a Dems v Republicans rant) but flagging a WikiLeaks story doesn't make sense.