Hmmmm.... and the shooter was a mentally disturbed LEFT-winger....
As are all left-wingers, to one degree or another. He wasn't insane to the point that he didn't know or understand what was going on. As a democrat supporter, he was pissed at her for something to do with one or more of her positions. He led a reasonably normal life (for a dopey/clueless liberal/lefty) prior to that.