 The FBI and other law enforcement agencies are currently investigating the perpetrator who was shot by the Secret Service, looking at his background and motivations and associations. And there's a lot of speculation from politicians, from people on social media and elsewhere about what this all means for the November election. Like with any other major news event, there is a lot of value in taking a step back and seeing how history can help us make sense of this moment. Because this is not the first time an assassination attempt has been made at a U.S. campaign event.