I’ll go out on a limb and say Tavis Smiley didn’t believe in American exceptionalism prior to these events.
Via NRO:
PBS host Tavis Smiley believes that resistance to another push for gun-control legislation, following this week’s Navy Yard shooting, and Republicans’ threatening a government shutdown over the president’s health-care law, is “all the evidence we need” to call into question the idea of American exceptionalism.