As tears stream down his face, President Barack Obama speaks at his final campaign stop on the evening before the 2012 presidential election in Des Moines, Iowa, Monday, November 5, 2012.
President Barack Obama receives the oath of office from Chief Justice John Roberts as first lady Michelle Obamas and his daughters Malia and Sasha look on at the ceremonial swearing-in at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013.
President Barack Obama walks through the Hyde Park Chicago neighborhood, Sunday, Aug. 12, 2012.
President Barack Obama, first lady Michelle Obama, and their daughters Sasha and Malia walk from Marine One to board Air Force One at Chicago O'Hare International Airport, Wednesday, Nov. 7, 2012.
U.S. President Barack Obama peers out of former South African president Nelson Mandela's cell, Section B, cell No. 5, on Robben Island, South Africa, Sunday, June 30, 2013.
President Barack Obama meets with Russia's President Vladimir Putin at the G20 Summit in Los Cabos, Mexico, Monday, June 18, 2012.
President Barack Obama and Saudi Arabia's King Salman walk together at Erga Palace in Riyadh, Saudi Arabia, Wednesday, April 20, 2016.
President Barack Obama and Indian Prime Minister Narendra Modi have coffee in the gardens of Hyderabad House in New Delhi, India, Sunday, Jan. 25, 2015.
President Barack Obama and Japanese Prime Minister Shinzo Abe lay a wreath at the USS Arizona Memorial, part of the World War II Valor in the Pacific National Monument, in Joint Base Pearl Harbor-Hickam, Hawaii, Tuesday, Dec. 27, 2016.
An osprey lands in the rain during the G-7 Summit near Garmisch-Partenkirchen, Germany, Monday, June 8, 2015.
President Barack Obama, first lady Michelle Obama, and Indian President Pranab Mukherjee stand during the U.S. national anthem at Rashtrapati Bhavan, the presidential palace, in New Delhi, India, Sunday, Jan. 25, 2015.
The shadow of President Barack Obama is seen as he walks to the White House Rose Garden in Washington, Monday, Nov. 7, 2011
President Barack Obama stretches to shake hands at a campaign rally in Fairfax, Va., Friday, Oct. 19, 2012.
President Barack Obama is helped to his feet by summer school kids in Chatfield, Minn., Monday, Aug. 15, 2011.
President Barack Obama and first lady Michelle Obama host the annual White House Easter Egg Roll on the South Lawn of the White House in Washington Monday, April 21, 2014.
President Barack Obama meets the Galesburg High School volleyball team in Galesburg, Ill., Wednesday, Aug. 17, 2011.
President Barack Obama holds a baby at Cape Cod Coast Guard Air Station in Bourne, Mass., Thursday, Aug. 18, 2011.
A light shines behind President Barack Obama as he speaks in Council Bluffs, Iowa, Monday, Aug. 13, 2012.
President Barack Obama embraces an audience member at Boise State University, Wednesday, Jan. 21, 2015.
President Barack Obama looks to the cheering crowd as he leaves the stage on election night in Chicago, Wednesday, Nov. 7, 2012.