This is WEEKEND EDITION from NPR News. I'm Rachel Martin. President Obama was officially sworn in today in a private ceremony at the White House. Tomorrow, he does it again publicly. By the time he's through, he and President Franklin Roosevelt will be the only two presidents to have taken the presidential oath four times each - Roosevelt because he was elected four times, and Obama because he ended up having to take the oath twice the first time and twice the second. NPR legal affairs correspondent Nina Totenberg explains.

NINA TOTENBERG, BYLINE: Mr. Obama took the oath of office twice last time because he and the chief justice messed it up a bit the first time and did it a second in private to quell any question about his being president. He's taking the oath twice this time because technically, Inauguration Day is today, Sunday, and the modern tradition has been that when that happens, the president takes a private oath on Sunday and does it again in public for the big ceremonial event on Monday.

It wasn't always like that. The first two presidents whose inauguration days fell on a Sunday waited until Monday to take the oath. The legal authority for doing that was none other than the great Chief Justice and founding father John Marshall. In 1821, then-Secretary of State John Quincy Adams wrote to Marshall noting that the inauguration of President James Monroe that year would fall on a Sunday, a day of religious sensibilities. So, what they should do? The answer was wait until Monday, according to Yale law professor Akhil Amar.

AKHIL AMAR: Marshall politely writes back and he says, well, usually we've waited until noon to do the inauguration, even though power transferred at midnight. If we can wait 12 hours, why not 36 hours?

TOTENBERG: So, President Monroe was sworn in on a Monday, and so too was Zachary Taylor in 1849. Rutherford Hayes was the first president to be sworn in privately, before the public event. But he did it on a Saturday. The rumor is that he did it to forestall any chance that his election opponent would challenge the disputed outcome of the balloting. The next time a president was sworn in privately was Woodrow Wilson, on a Sunday. He allegedly feared leaving the country without a sitting president for a whole day at a time when the nation was on the brink of entering World War I.

After that, tradition seemed to take hold when Inauguration Day fell on a Sunday. Dwight Eisenhower was sworn in privately for his second term and then on Monday again at the formal inauguration. Ronald Reagan did the same thing; and even though the Sunday oath was called a private ceremony, it was broadcast. President Obama's will be too. The presidential oath is the only one spelled out in the Constitution and it's shortest of any official oath. Interestingly, not included in the Constitution are the words used by perhaps all presidents: So help me God. I say perhaps because George Washington may not have used those words. He set the standard for future presidents in many matters. Even though he was a general, he wore civilian clothes. He took the oath on a Bible, and for a long time it was believed he said so help me God. That, however, is not so clear any more, as Professor Amar observes.

AMAR: In my last book in 2005, I actually suggested that he did. I now think that I goofed.

TOTENBERG: That's because the source for all the stories about Washington saying so help me God was a biographer who claimed to have attended the inauguration at age six and heard Washington say those words. But none of the very detailed contemporaneous accounts of the inauguration mentioned the first president adding so help me God to the oath, and the writer who popularized the notion decades later, Washington Irving, was a famous fabulist. He was famous for making things up.

President Obama's first oath-taking ran into a snafu over pauses. Chief Justice John Roberts wrote out the oath as he planned to administer it, marking the places where he planned to pause for Obama to repeat the words. He had the card emailed to the designated congressional staffer handling these matters. But as Jeffrey Toobin reports in his book, "The Oath," the card never made it to Obama's people. And at the ceremony, things quickly went awry, with Obama interrupting where he thought the first pause would be, and the chief justice, who had memorized the oath and not brought a copy with him, becoming flustered, and saying the words in the wrong order. The ensuing blogosphere furor suggesting that Obama was not president provoked the White House counsel, Gregory Craig, to call Roberts two days later and ask him to administer the oath a second time in private. And so Chief Justice Roberts, on his way home from work, stopped at the White House to do just that. Gregory Craig:

GREGORY CRAIG: It was re-administered and it was done flawlessly. And there's a videotape of it somewhere.

TOTENBERG: As it turns out, says author Toobin, it was hardly the first time that the oath had been botched. In 1929, when Chief Justice William Howard Taft swore in Herbert Hoover, he substituted a word so that the president promised to preserve, maintain and defend the Constitution, instead of preserve, protect and defend it.

JEFFREY TOOBIN: When that mistake was pointed out to him, he said, oh, before radio, we messed it up even more than that.

TOTENBERG: Nina Totenberg, NPR News, Washington.

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