In the end, this was the act of a sick individual. He was not acting in the interest of the Democrats - or the Republicans for that matter. I doubt that politics even has very much to do with it, just as I doubt that religious fervor is truly what guides the hands of certain extremists who invoke the names of Muhammad and Allah. People such as this do what they do because of what is within them - because of the sickness which consumes their souls. The excuses of politics and religion are precisely that - excuses. And nothing more.
This is the key, right here. When the Oklahoma City Bombings happened, did we care whether the bombers were liberal or conservative? No. We condemned what they did and who they were as people. That's what we should be doing here.
We're in an age where there is literally too much information that instead of getting easier to figure out what the "truth" is (or at least a few degrees of separation away from the truth) it's getting far more difficult.