WASHINGTON (AP) -- President Barack Obama takes the oath of office Sunday surrounded by family in an intimate inauguration ceremony at the White House.
The subdued swearing-in is 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.
A crowd of up to 800,000 people is expected to gather on the National Mall to witness the second inauguration.
Vice President Joe Biden will also be sworn in Sunday in a small, early morning ceremony at the Naval Observatory, his official residence.