It’s subliminal, plain and simple. Call it what you want: advertising, politiking or sending the message that Big Brother is watching. It’s still illegal and it has made none of the news. Of course, if there had been a GWB poster hanging there, or even an American flag...
If I had seen that hanging in my polling place, I would have walked up to it, flipped it the bird, and dared them to throw me out before I voted.