It's becoming increasingly clear that Jared Lee Loughner is mentally unstable. Sarah Palin's bullseye on Arizona Democratic Rep. Gabrielle Giffords did not direct Loughner to shoot Giffords point-blank in the head on January 8, 2011. Did the vitriol in political discourse, crosshairs and phrases like "Don't retreat, reload" (by Sarah Palin) or "If they bring a knife to the fight, we bring a gun" (by President Obama) influence Loughren's state of mind? Perhaps in an idiosyncratic way, according to Dr. Jeffrey Lieberman, chairman of psychiatry at Columbia University. "Political rhetoric provided some of the context for his thinking, the pretext...