WASHINGTON

President Barack Obama was sworn in for four more years yesterday in a simple ceremony at the White House, embarking on a second-term quest to restore a still-shaky economy and combat terrorists overseas while swearing an age-old oath to "preserve, protect and defend" the Constitution.

"I did it," a smiling president said to his daughter Sasha, seconds after following Chief Justice John Roberts in reciting the oath of office. First lady Michelle Obama and the couple's other daughter, Malia, were among relatives who bore witness.

The quiet moments were a prelude to today's public inaugural events when Obama and Vice President Joe Biden will be sworn in on the steps of the U.S. Capitol before a crowd expected to reach into the hundreds of thousands and a television audience in the millions.

The trappings were in place -- the flag-draped stands ready outside the Capitol and the tables set inside for a traditional lunch with lawmakers.

Across town, a specially made reviewing stand rested outside the White House gates for the president and guests to watch the traditional parade down Pennsylvania Avenue.

A crowd of perhaps 800,000 was forecast, less than the million-plus that thronged to the nation's capital four years ago to witness the inauguration of the first black president in American history.

The weather forecast was encouraging, to a point. High temperatures were predicted for the lower 40s during the day, with scattered snow showers during the evening, when two inaugural balls close out the official proceedings.

The 44th chief executive is only the 17th to win re-election, and his second-term goals are ambitious for a country where sharp political differences have produced gridlocked government in recent years.

Restoration of the economy to full strength and pressing the worldwide campaign against terrorists sit atop the agenda. He also wants to reduce federal deficits and win immigration and gun-control legislation from Congress, where Republicans control the House.

If he needed a reminder of the challenges he faces, he got one from halfway around the globe. An Algerian security official disclosed the discovery of 25 additional bodies at a gas plant where radical Islamists last week took dozens of foreign workers hostage.

Obama took the oath in the White House's Blue Room, where portraits of Presidents John Adams, Thomas Jefferson, James Madison and John Tyler grace the walls. He placed a hand on a Bible held by his wife. His daughters stood nearby.

The nation's political divisions seemed scarcely to intrude as Obama, a Democrat, shook hands with Roberts, a Republican appointee. Unlike four years ago, when Roberts stumbled verbally, the chief justice recited the oath without error.

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