WHITE HOUSE —
President Barack Obama has been formally sworn in for a second four-year term. Vice President Joe Biden also took the oath of office Sunday before Monday's public inauguration ceremony, to be witnessed by hundreds of thousands of people on the National Mall.
Obama took the oath just before noon in a ceremony lasting about half a minute in the oval-shaped White House Blue Room, with views of the executive mansion's South Lawn sweeping down to the Washington Monument.
With First Lady Michelle Obama, daughters Malia and Sasha, and a small group of reporters looking on, Supreme Court Chief Justice John Roberts administered the oath.
Obama shook Roberts hand, kissed his wife and children, and said to his family, "I did it."
This was the seventh time in U.S. history a president has taken the oath on Sunday, before a public ceremony the following day. The U.S. Constitution requires a president's term to begin on January 20.
Obama used a Bible that belonged to his wife's grandmother, LaVaughn Delores Robinson.
In his public inauguration Monday at the U.S. Capitol, he will again lay his hand on the bible used by President Abraham Lincoln at his inauguration in 1861.
Obama will also use a second bible, once owned by the late civil rights leader Dr. Martin Luther King Jr. The ceremony occurs on the national holiday established to honor Dr. King.
This year also marks the 50th anniversary of the 1963 March on Washington for equal rights for African-Americans, and the 150th anniversary of President Lincoln's Emancipation Proclamation that initiated the process of freeing slaves in America.
President Obama and his family also attended a Sunday service at the Metropolitan African Methodist Episcopal Church, which has an important place in history for African-Americans.
Vice President Joseph Biden, Jr. takes the oath of office, administered by Associate Supreme Court Justice Sonia Sotomayor in the residence of the vice president in Washington, January 20, 2012.
Earlier, Vice President Biden took the oath at his official residence at the Naval Observatory in Washington, using a Biden family bible.
It was administered by Supreme Court Justice Sonia Sotomayor, and was the first time a Hispanic-American has done so.
The president and Biden also laid a wreath at the Tomb of the Unknowns at Arlington National Cemetery to honor fallen members of the military.
Obama begins his second term amid a mix of public optimism and pessimism about the economy, and the ability of leaders to put aside partisan bickering to prioritize progress on job creation and fixing fiscal problems.
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The president's personal approval and likability ratings are high. Polls show a majority of Americans more optimistic about his second term. But fewer than half believe Obama and Republicans will be able to work together.
John Hudak is an expert in governance at the Brookings Institution. "The best solution right now is whatever he can get through Congress and is willing to sign, and the more he works with Congress under that heading, under that concept of executive - legislative relations, the more beneficial it will be in terms of addressing the real problems that we face," he said.
The official theme of Obama's second inaugural is "our people, our future". Specifics of his address on Monday are not known. Aides said he continued to make changes to the speech.
While he may make reference to political gridlock in Washington, a White House video released last week appeared to provide a hint of part of his overall message.
"This country has gone through some very tough times before, but we always come out on the other side," said the president. "This task of constantly perfecting our union, making it more fair and making sure that everybody in this country has a fair shot that if you work hard you can make it regardless of the circumstances of your birth, or what you look like, or where you come from, what God you pray to."
About three weeks will separate Obama's inaugural address on Monday, and his State of the Union Address on February 12.
He will use that speech to lay out specific policy objectives for his second term, with the economy, immigration reform, new gun control legislation and continuing the drawdown of U.S. combat troops from Afghanistan topping the agenda.