After the Arizona tragedy, left-winger Andy Revkin finds a lesson for us: Don't criticize a warmist politician, or you'll feel extra-bad if some nut subsequently shoots that politician?

Twitter / Andy Revkin: Tucson, 7/09, Giffords pic ...

Tucson, 7/09, Giffords picketer holds up Cap'n'Traitor skull-bones sign. Not so funny now? http://twitpic.com/3o8ckr Vid http://j.mp/TeaSgn