U.S. Secretary of State Hillary Rodham Clinton at the State Department in Washington, July 25, 2012.

U.S. President Barack Obama speaks to reporters as he tours Shwedagon Pagoda with Secretary of State Hillary Clinton in Rangoon, Burma, November 19, 2012.

Actress Meryl Streep uses her iPhone to get a photo of her and Secretary of State Hillary Clinton following the Kennedy Center Honors gala in Washington, December 1, 2012.

U.S. Secretary of State Hillary Clinton, meets with Australian officials upon her arrival in Perth, November 13, 2012.

U.S. Secretary of State Hillary Clinton gestures as she addresses journalists after meeting with the High Representative for EU Foreign Policy Catherine Ashton, Sarajevo, Bosnia, Tuesday, October 30, 2012.

U.S. Secretary of State Hillary Clinton, left, and U.S. Ambassador to United Nations Susan Rice listen as President Barack Obama addresses the 67th session of the United Nations General Assembly, September 25, 2012.

U.S. Secretary of State Hillary Clinton watching a replay of former president Bill Clinton's speech at the Democratic National Convention, September 6, 2012.

U.S. Secretary of State Hillary Clinton, center, pays her respects after signing the guest book for Ghana's late President John Atta Mills' funeral in Accra, Ghana, August 10, 2012.

U.S. Secretary of State Hillary Clinton meets with Nelson Mandela, former president of South Africa, at his home in Qunu, South Africa, August 6, 2012.

Aung San Suu Kyi, right, and U.S. Secretary of State Hillary Clinton after speaking to the press at Suu Kyi's residence in Rangoon, Burma, December 2, 2011.