If it was right wing extremists the Democrats and media would use it to crucify Republicans/Tea Party and possibly destroy any hope of a beneficial outcome in the 2014 elections.
If it was middle eastern terrorists we're looking at what could be the beginning of European style terrorism in the United States... which is a horrible thing considering no public place would be safe.
If it was left wing extremists (like Christopher Dorner, Aurora Shooter, Sandy Hook Shooter, Virginia Tech, etc) it's business as usual.
Watch yourself. I'll light you up.