U.S. President Barack Obama wipes his tears while speaking about U.S. First Lady Michelle Obama, not pictured, during his farewell address in Chicago, Illinois, U.S., on Tuesday, Jan. 10, 2017. Obama blasted 'zero-sum' politics as he drew a sharp contrast with his successor in his farewell address Tuesday night, acknowledging that despite his historic election eight years ago his vision for the country will exit the White House with him. Photographer: Christopher Dilts/Bloomberg via Getty Images