I think the fellow could have illustrated his point equally well by doing something to the Palin effigy other than hanging it. Hanging, as a symbol, carries too much baggage to send a clear and unambiguous message. And, face it, it really lacks originality.

Personally, I would have portrayed her being tortured by a power-drill wielding environmentalist accompanied by a "Drill, baby, drill!" caption. Or maybe just being eaten by a polar bear. Or a moose.