I've had a couple political discussions over statuses and this message has been popping up whenever I mention Obama or the election. I haven't posted anything offensive, and it's always discussions with friends who wouldn't report it. My friends got the same warning. And it's not an isolated incident, I've seen this image circulated by people who say it pops up in political discussions.
I think it's interesting to note that Obama's press secretary has connections with Facebook. I'm not trying to be paranoid, but this is weird.