U.S. President-elect Barack Obama, along with wife Michelle and daughters Sasha and Malia, wave during his election night victory rally in Chicago, on November 4, 2008. #

Photographers crowd a camera stand as people fill the National Mall before the inauguration of Barack Obama and Joe Biden at the U.S. Capitol in Washington, District of Columbia, on January 20, 2009. #

President Barack Obama and first lady Michelle Obama dance at the Commander in Chief Inaugural Ball at the National Building Museum in Washington, District of Columbia, on January 20, 2009. #

Barack and Michelle Obama share a private moment in a freight elevator at one of the inaugural balls as aides look away, on the evening of his inauguration day, on January 20, 2009. #

Barack Obama, sitting next to 5-year-old Nick Aiello, sips his beverage while attending the Washington Wizards NBA basketball game against the Chicago Bulls in Washington, District of Columbia, on February 27, 2009. #

Obama takes aim with a photographer's camera backstage prior to remarks about providing mortgage payment relief at Dobson High School in Mesa, Arizona, on February 18, 2009 and later released by the White House. #

President Barack Obama and First Lady Michelle Obama wear 3-D glasses while watching the NFL's Super Bowl XLIII game at a Super Bowl Party with family, friends, staff members and bipartisan members of the U.S. Congress, in the family theater of the White House, on February 1, 2009. #

First lady Michelle Obama flexes her arms in response to a joke about her habit of wearing sleeveless dresses during the White House Correspondents' Association Dinner in Washington, District of Columbia, on May 9, 2009. #

Obama receives a standing ovation before speaking at Cairo University in Cairo, Egypt, on June 4, 2009. In his speech,President Obama called for a "new beginning between the United States and Muslims", declaring that "this cycle of suspicion and discord must end". #

Barack Obama places a rose in front of the gate building at the Buchenwald concentration camp near Weimar, Germany, on June 5, 2009. Obama, who is en route from Egypt to France, visited Dresden before visiting the former Nazi concentration camp Buchenwald and the US regional medical center in Landstuhl during his stopover in Germany. #

President Obama fist-bumps custodian Lawrence Lipscomb in the Eisenhower Executive Office Building following the opening session of the White House Forum on Jobs and Economic Growth, on December 3, 2009. #

President Obama meets with members of his Cabinet in the Cabinet Room of the White House, on January 29, 2010. The President's chair is marked with a plaque engraved with the date of his inauguration. #

Standing in the rain, President Obama pauses as he makes a statement to reporters at the Coast Guard Venice Station in Venice, Louisiana, as he visits the Gulf Coast region affected by the BP oil well spill, on May 2, 2010. #

President Obama listens to Maude Smith and her grandson David Robichaux Jr. in their home in the Columbia Parc Development in New Orleans, Louisiana, on August 29, 2010. #

President Barack Obama speaks after addressing the nation about the end of the U.S. combat mission in Iraq from the Oval Office of the White House in Washington, District of Columbia, on August 31, 2010. #

As Trip Director Marvin Nicholson tries to weigh himself, President Obama puts his toe on the scale during a hold in the volleyball locker room at the University of Texas in Austin, Texas, on August 9, 2010. #

In the Situation Room of the White House, President Obama and Vice President Joe Biden, along with members of the national security team, receive an update on the mission against Osama bin Laden, on May 1, 2011. #

President Obama fist bumps a young person reaching through the door at the Cidade de Deus (City of God) favela Community Center in Rio de Janeiro, Brazil, on March 20, 2011. #

During the tenth anniversary ceremonies of the September 11, 2001 terrorist attacks at the World Trade Center site, President Obama looks out at the North Pool of the 9/11 Memorial, on September 11, 2011 in New York City. #

President Obama reacts after realizing he dialed the wrong number while making calls from a local campaign field office during a unscheduled visit in Orlando, Florida, on October 28, 2012. #

Photographer Pete Souza: "We had just arrived aboard the Marine One helicopter on the South Lawn and the President was walking into the White House. I had seen this scene several times but had never been able to quite capture it the way I wanted. Here, finally, arriving at night, I was able to frame him walking into the light of the Diplomatic Reception Room, with the added bonus of his shadow being cast from the television lights off to the left." Photo taken on March 30, 2012. #

President Obama talks with Jimmy Fallon during a taping of "Late Night With Jimmy Fallon" at Memorial Hall on the University of North Carolina Chapel Hill campus in Chapel Hill, North Carolina, on April 24, 2012. #

Photographer Pete Souza: "We were doing an event at the Henry Ford Museum in Dearborn, Michigan. Before speaking, the President was looking at some of the automobiles and exhibits adjacent to the event, and before I knew what was happening he walked onto the famed Rosa Parks bus. He sat in one of the seats, looking out the window for a only few seconds." Photo taken on April 18, 2012. #

Photographer Pete Souza: "We had just arrived at the helicopter landing zone in Chicago and instead of walking right to the motorcade, the President and First Lady walked past their vehicle to the edge of Lake Michigan to view the skyline of their home town." Photo taken on June 15, 2012. #

Republican presidential nominee Mitt Romney and President Barack Obama speak directly to each other during the second U.S. presidential debate in Hempstead, New York, on October 16, 2012. #

President Obama hugs North Point Marina owner Donna Vanzant as he tours damage done by Hurricane Sandy in Brigantine, New Jersey, on October 31, 2012. At left is New Jersey Governor Chris Christie. Putting aside partisan differences, Obama and Christie toured storm-stricken parts of New Jersey together, taking in scenes of flooded roads and burning homes in the aftermath of superstorm Sandy. #

Photographer Pete Souza: "The President, about to be caught in Spider-Man's web as he greets Nicholas Tamarin, 3, just outside the Oval Office. Spider-Man had been trick-or-treating for an early Halloween with his father, White House aide Nate Tamarin in the Eisenhower Executive Office Building." Photo taken on October 26, 2012. #

President Barack Obama hugs first lady, Michelle Obama, after she introduces him at a campaign event at the Village of East Davenport in Davenport, Iowa, August 15, 2012. #

President Obama reacts as Counterterrorism chief and adviser John Brennan briefs him at the White House on the details of the shootings at Sandy Hook Elementary School in Newtown, Connecticut, on December 14, 2012. The president later said during a television interview that this was "the worst day of his Presidency." #