Gallery: Obama sworn-in

President Barack Obama is officially sworn-in by Chief Justice John Roberts in the Blue Room of the White House during the 57th Presidential Inauguration in Washington. Photo: AP

President Barack Obama is officially sworn-in by Chief Justice John Roberts in the Blue Room of the White House during the 57th Presidential Inauguration in Washington. Photo: AP

U.S. political buttons are seen on display being sold by a vendor along the National Mall in Washington January 20, 2013. U.S. Vice President Joe Biden took the oath of office for his second term on Sunday at a small ceremony at his official residence, using a bible with a Celtic cross on the cover that has been in his family since 1893. The U.S. Constitution requires the president and vice president to be sworn in on January 20. President Barack Obama is slated to take his oath at a small ceremony at the White House at 11:55 a.m. EST (1655 GMT). REUTERS/Shannon Stapleton UNITED STATES (POLITICS SOCIETY)

People gather near the Capitol building in Washington D.C. President Barack Obama took the official oath for his second term at the White House in a small, private ceremony that set a more subdued tone compared to the historic start of his presidency four years ago. Photo: Reuters

A vendor holds items for sale on the National Mall with the U.S. Capitol prepared for the ceremonial swearing-in of President Barack Obama, the 57th Presidential Inaugural in Washington. Photo: AP

A man sells magnets on the National Mall in Washington D.C. President Barack Obama took the official oath for his second term at the White House in a small, private ceremony that set a more subdued tone compared to the historic start of his presidency four years ago. Photo: Reuters

U.S. President Barack Obama is sworn in for a second term as President of the United States in the Blue Room of the White House in Washington. Photo: Reuters

Tajidddin Ahmed of Atlanta, who is attending the inauguration, wears a jacket filled with buttons in support of U.S. President Barack Obama as he stands on the National Mall in Washington. Photo: Reuters

U.S. President Barack Obama (L) and Vice President Joe Biden (C) are pictured as they listen to taps being played after laying a wreath at the Tomb of the Unknown Soldier at Arlington National Cemetery near Washington. Photo: Reuters

A vendor sells U.S. flags with U.S. President Barack Obama pictured on them, in Washington, D.C. Photo: Reuters

A vendor holds a figurine head of U.S. President Barack Obama on the National Mall in Washington. Photo: Reuters

With a portrait of former U.S. President James Madison in the background, U.S. President Barack Obama takes the oath of office as frst lady Michelle Obama holds a bible during the official swearing-in ceremony at the White House in Washington. Photo: Reuters

With a portrait of former US President James Madison in the background, US President Barack Obama takes the oath of office as frst lady Michelle Obama holds a bible during the official swearing-in ceremony at the White House. Photo: Reuters

A man stands wearing a hat in support of US President Barack Obama on the National Mall in Washington. Photo: Reuters

A sticker with the image of US President Barack Obama is seen on a parking sign along the National Mall in Washington. Photo: Reuters

The US Capitol building is seen in Washington. Photo: Reuters

US flags are seen along the presidential parade route in Washington. Photo: Reuters