0:35: Americans like to think of their country as exceptional. But it's exceptional for all the wrong reasons. In this segment of the show: Commentary on the massacre in Las Vegas, the day-to-day violence in Baltimore, and the huge challenge that current U.S. political leadership is unwilling to take — rolling back the nation's obsession with guns.6:21: A tribute to rock legend Tom Petty, who performed with his band, The Heartbreakers, in Baltimore in July, part of a 40th anniversary tour that ended just a few weeks before Petty's death in California on Monday.