4. It's the international sign of distress. I did the same when the shrub got re-appointed.
I've got my original (and only) 9-11 flag mounted upside down just for such events. If rMoney had stolen this one, it would be out at half mast, tattered as it is. Instead, I've got my other flag flying proudly and I'm leaving up my Obama signs just to piss off two of my neighbors who are overt racists.
While I don't agree with his reason for doing it, the symbolism is significant and it's fair game on either side. I'm not sure McD's would agree with his doing it under their logo, but that is another matter. Besides, it's a good way to know where not to buy anything.