He gives the appearance of a strikingly laid-back victor, this presumptive Democratic presidential nominee.

On the day before the night he made history, Barack Obama shot hoops at the Back Bay Club in Chicago, and called the odd superdelegate or two. Then he and his wife, Michelle, kissed their daughters goodnight and, with a half dozen of their best friends, rode to Midway Airport to catch a flight to St. Paul to claim his prize. He sat on the plane, legs crossed, chuckling, chatting, giving little hint of what roiled within.

Obama has written of his “spooky good fortune” in politics, and vaulting ambition and self-possession define his rise.

He turned down a prestigious federal appellate court clerkship while at Harvard to work as a community organizer. He wrote an autobiography at the age of 33, and another 11 years later. He brushed aside a liberal mentor who stood in his way in Illinois. After just two years in the United States Senate, he announced that he would run for the presidency and then upended a Democratic Party powerhouse.

Obama remains a protean political figure, inspiring devotion in supporters who see him as a transformative leader even as he remains inscrutable to critics.

He has the gift of making people see themselves in him and offers an enigmatic smile when asked about his multiracial appeal.

“I am like a Rorschach test,” he said in an interview with The New York Times. “Even if people find me disappointing ultimately, they might gain something.”

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