 I am told by law enforcement sources that the online environment is awash in calls for violence, conspiracy theories. I've worked, unfortunately, far too many mass shootings. There are often calls for retaliatory violence and copycat attacks. The Republican National Convention is set to get underway tomorrow in Milwaukee. CBS's Natalie Brand is there. RNC delegates and volunteers shocked by the shooting say they will carry on. How do you think the tone will change this week?