 Well, the theories pointing fingers at the opposition could compound the tensions and divisions already high in the election season. We're seeing leaders from both parties calling for the rhetoric to be more toned down. And historically, that's important for leaders to do. Megan Squire, a Southern Poverty Law Center, watches online extremists and their message boards closely. While she sees a lot of speculation in the far right about the attack, she's also seeing uncertainty about whether or not this is the moment to mobilize.