Supreme Court Justice Sonia Sotomayor (AP) 
 
 Vice President Biden has chosen Supreme Court Justice Sonia Sotomayor to swear him in later this month, making her the fourth woman and first Hispanic to administer the presidential or vice-presidential oath. 
 
 President Obama will stick with tradition and be sworn in by Chief Justice John G. Roberts Jr. The two stumbled through the ceremony four years ago, and had to take a do-over later to make sure constitutional standards were met. 
 
 The Presidential Inaugural Committee made the announcement Friday morning. The justices will administer the oaths to Obama and Biden twice, at the "private" swearing-in on the constitutionally mandated date of Sunday, Jan. 20, and again during the public ceremony on Monday, Jan. 21. 
 
 The committee said three women have previously sworn in presidents and vice presidents: Judge Sarah T. Hughes swore in President Johnson in 1963; Justice Sandra Day O’Connor swore in Vice President Dan Quayle in 1989; and Justice Ruth Bader Ginsburg swore-in Vice President Al Gore in 1997. 
 
 
 
 "It's an incredible honor to have Associate Justice Sonia Sotomayor swear me in,” Vice President Biden said. “I believed strongly that she would make a great Justice, and it was one of the greatest pleasures of my career to be involved in her selection to the Court. From the first time I met her, I was impressed by Justice Sotomayor’s commitment to justice and opportunity for all Americans, and she continues to exemplify those values today. Above all, I’m happy for the chance to be sworn in by a friend – and someone I know will continue to do great things.” ||||| FILE - In this Jan. 20, 2009, file photo, Barack Obama, left, takes the oath of office from Chief Justice John Roberts, not seen, as his wife Michelle, holds the Lincoln Bible and daughters Sasha, right... (Associated Press) 
 
 Formally embarking on his second term, President Barack Obama will take the oath of office Sunday surrounded by family in an intimate inauguration at the White House, 24 hours before re-enacting the ceremony before an excited crowd of hundreds of thousands outdoors at the Capitol. 
 
 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 that event, which will take place on the Capitol's red, white and blue bunting-draped west front. Supreme Court Chief Justice John Roberts, who famously flubbed the oath of office that Obama took in 2009, will swear the president in both days. 
 
 Vice President Joe Biden will also be sworn in Sunday in a small, early morning ceremony at the Naval Observatory, his official residence. Justice Sonia Sotomayor, who was appointed by Obama during his first term, will administer the oath of office to the vice president. 
 
 Once the celebrations are over, Obama will plunge into a second-term agenda still dominated by the economy, which slowly churned out of recession during his first four years in office. The president will also seek to cement his legacy with sweeping domestic changes, pledging to achieve both an immigration overhaul and stricter gun laws despite opposition from a divided Congress. 
 
 But for one weekend at least, Washington was putting politics aside. Obama called the nation's inaugural traditions "a symbol of how our democracy works and how we peacefully transfer power." 
 
 "But it should also be an affirmation that we're all in this together," he said Saturday, as he opened a weekend of inaugural activities at a Washington elementary school. 
 
 Only a small group of family members is expected to attend Obama's Sunday swearing-in, including first lady Michelle Obama and daughters Malia and Sasha. A small group of reporters will also be in the room to witness the event. 
 
 Roberts will administer the oath of office shortly before noon in the White House Blue Room, an oval space with majestic views of the South Lawn and the Washington Monument. Named for the color of the drapes, upholstery and carpet, the Blue Room is not typically used for ceremonies and instead has primarily been a reception room as well as the site of the only presidential wedding held in the White House, between then-President Grover Cleveland and Frances Folsum in 1886. 
 
 Later Sunday, Obama and Biden will speak at an inaugural reception attended by supporters. 
 
 But the president will save his most expansive remarks for Monday, when he delivers his second inaugural address to the crowd gathered on the Mall and millions more watching across the country and the world. Obama started working on the speech in early December and was still tinkering with it into the weekend, aides said. 
 
 The president's address will set the stage for the policy objectives he seeks to achieve in his second term, including speeding up the economic recovery, passing comprehensive immigration and gun control measures and ending the war in Afghanistan. However, aides said Obama would save the specifics of those agenda items for his Feb. 12 State of the Union address. 
 
 The president launched a weekend of inaugural activities Saturday by heading up a National Day of Service. Along with his family, Obama helped hundreds of volunteers spruce up a Washington area elementary school. 
 
 His shirt sleeves rolled up, Obama donned a pair of rubber gloves, picked up a paint brush and helped volunteers stain a bookshelf. 
 
 Obama added the service event to the inaugural schedule in 2009 and is hoping it becomes a tradition followed for future presidents. 
 
 Mrs. Obama, speaking to volunteers Sunday, espoused the importance of giving back in the midst of the weekend of pomp, circumstance and celebration. 
 
 "The reason why we're here, why we're standing here, why we're able to celebrate this weekend is because a lot of people worked hard and supported us, and we've got a job to do and this is a symbol of the kind of work that we need to be doing the next four years," Michelle Obama said at Burrville Elementary. 
 
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 Follow Julie Pace at http://twitter.com/jpaceDC ||||| Barack Obama and John Roberts were all smiles when the chief justice swore in the president on Sunday — a cordial performance they’ll likely repeat during the public swearing-in on Monday. 
 
 But the serene tableau obscures the tumultuous relationship between the two since their first awkward public interaction during the botched oath of office four years ago. 
 
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 reset Inauguration 2013: Obama official swearing-in 
 
 On Sunday, Roberts read the oath from a piece of paper — and both men seemed relieved when it was over. They exchanged congratulations and thanks, and then Obama turned to his daughter Sasha. “I did it,” he told her. “You didn’t mess up,” she replied. 
 
 (See also: Complete coverage of the Inauguration 2013) 
 
 The historical fates of Obama and Roberts are more intertwined than those of any chief justice and president in recent decades. For much of Obama’s first four years in office, the pair seemed to be at loggerheads — particularly after the Supreme Court’s 2010 Citizens United decision upheld corporations’ right to spend money on elections. Obama trashed the ruling at his State of the Union Address with Roberts and six other justices sitting right in front of him. 
 
 The tension lifted briefly and dramatically last June, when Roberts joined with Democrats on the court to uphold a pivotal part of Obama’s signature health care reform law, the individual mandate. But experts predict the Roberts-led court will continue to challenge the president’s policies in areas that will shape the future of the nation, including affirmative action, immigration and the environment. 
 
 (PHOTOS: Obama’s first term) 
 
 And that means the two men, each with a keen sense of his place in history, are likely to clash again during Obama’s second term. 
 
 “When you have a president and a chief justice of distinctly opposing philosophies, that’s a recipe for conflict, and it has been one, and it will be one,” said Jeffrey Toobin, an author of several books on the court and a legal analyst for CNN. “I don’t think there has been a level of ideological conflict between the president and the chief justice like this since the ’30s.” 
 
 Other analysts say it’s still too early to say whether the Obama-Roberts rivalry is destined for the history books. 
 
 “The Obama and Roberts differences are real and meaningful and will probably find expression in a number of other important cases over the next four years,” said Jeff Shesol, author of “Supreme Power: Franklin Roosevelt vs. The Supreme Court.” “Whether it rises to the level of other kinds of presidential-judicial rivalries is something we’ll probably have to judge in retrospect.” 
 
 Obama and Roberts’s relationship got off to a famously rocky start during the 2009 Inauguration, when Obama jumped in prematurely to recite the oath and the chief justice then mangled the wording. Both men reportedly apologized for the episode, which Roberts may have exacerbated by trying to recite the oath by memory. The White House summoned him to the Map Room for a do-over the next day, just to make sure Obama was officially the president. 
 
 (PHOTOS: 10 inaugural controversies from history) 
 
 The first big flash point came about a year later, when the Supreme Court handed down the Citizens United decision. Obama immediately denounced it as “a green light to a new stampede of special interest money in our politics” and “a major victory for big oil, Wall Street banks, health insurance companies and the other powerful interests that marshal their power every day in Washington to drown out the voices of everyday Americans.”
– Washington is still putting the finishing touches on tomorrow's every-four-years inauguration party, but it'll be a day late: President Obama will quietly be sworn in for a second term today, due to a Constitutional quirk that mandates that the commander in chief be sworn in at noon on January 20. Because that fell on a Sunday, when inaugurations aren't held, Obama will take the oath at the White House today and tomorrow's ceremony is essentially a re-enactment, reports the AP. Chief Justice John Roberts—who famously flubbed the oath four years ago—will swear the president in both times, notes Politico in a look at the at-times tempestuous relationship between the two men. Joe Biden was also sworn in this morning in a small ceremony at the Naval Observatory, with Justice Sonia Sotomayor administering the oath. Roll Call notes that he used a 5-inch-thick Bible that had been in his family since 1893; Sotomayor is the first Hispanic justice to swear in a president or vice president, reports the Washington Post. "Above all, I’m happy for the chance to be sworn in by a friend—and someone I know will continue to do great things," said Biden.