WASHINGTON (January 20, 2013)--Chief Justice John Roberts administered the oath of office to President Barack Obama Sunday in the Blue Room of the White House in a ceremony witnessed by First Lady Michelle Obama, daughters Sasha and Malia, and a few reporters.

Mr. Obama will take the oath again on Monday during a public swearing-in at the Capitol before hundreds of thousands of people.

Earlier, the president and Vice President Joe Biden honored the nation's fallen soldiers, placing a wreath, adorned with red, white and blue ribbon, in front of Arlington's Tomb of the Unknowns.

Mr. Obama and his family then attended services at the historic Metropolitan African Methodist Episcopal Church in downtown Washington.

Biden was also sworn in to a second term earlier this morning.

The subdued swearing-in was a function of the calendar and the Constitution, which says presidents automatically begin their new terms at noon on Jan. 20.

Because that date fell this year on a Sunday, a day on which inaugural ceremonies historically are not held, organizers scheduled a second, public swearing-in for Monday.