President Barack Obama, visiting Watertown, South Dakota, on Friday, May 8, shows off a note given to him by 11-year-old Rebecca Kelley. Rebecca had written him a letter asking him to visit South Dakota, which is the 50th state Obama has visited during his time in office. White House photographer Pete Souza highlights a picture from each state.
Marching at the 50th anniversary of Bloody Sunday in Selma, Alabama, on March 7, 2015.
Air Force One refueling at Elmendorf Air Force Base near Anchorage, Alaska, on November 12, 2009.
Viewing the Grand Canyon in Arizona on August 16, 2009.
Touring tornado damage in Vilonia, Arkansas, on May 7, 2014.
Viewing the Golden Gate Bridge in San Francisco, California, on July 23, 2014.
Playing pool with Gov. John Hickenlooper in Denver, Colorado, on July 8, 2014.
Making last-minute edits to his speech in Newtown, Connecticut, before a vigil for those killed at Sandy Hook Elementary School on December 16, 2012.
Honoring fallen soldiers from Afghanistan at Dover Air Force Base in Delaware on October 29, 2009.
Keeping his distance from a baby alligator on Earth Day at Everglades National Park in Florida on April 22, 2015.
Graduates cheering the President during a heavy downpour at Morehouse College in Atlanta, Georgia, on May 19, 2013.
Swimming at Pyramid Rock Beach in Kaneohe Bay, Oahu, Hawaii, on January 1, 2012.