Bet you a buck it's a hoax. Does that "B" look like it was cut with a knife? And it's reversed -- like someone scratching it on while looking in a mirror. A careful, dyslexic robber?
If not I'm going to feel like a cynical bastard. But I think, "Nah." My intuition is that we have a woman punched by her boyfriend and looking for some drama. No: of course it's not a campaign ploy, I'm guessing a lone, disturbed woman.