Newly released documents confirmed in 2012 that Barack Obama Sr., the president's father, had been effectively pushed out of Harvard's doctoral program in 1964 after immigration officials raised concerns about his conduct and the university declined to support his continued enrollment, adding texture to a family history that the president had written about in his memoir with incomplete information.

The documents, obtained and published by the Boston Globe, included a letter from the Harvard administrator who coordinated with immigration officials concluding that Obama Sr. "has been here longer than he should be." The official recommended against supporting a visa extension.

Obama Sr. had come to the United States as a Kenyan student on scholarship, first to the University of Hawaii, where he met Ann Dunham, and then to Harvard for doctoral work in economics. His departure from Harvard preceded his return to Kenya and the essentially absent relationship with his American son that shaped Barack Obama Jr.'s childhood and self-understanding.

The documents added complexity to the story of Obama Sr.'s American years. The Harvard exit was not simply the return of a successful student to serve his home country; it was an involuntary departure managed by institutions responding to concerns about his personal conduct.

For the president, whose 1995 memoir had excavated his complicated relationship with an absent father he had met only once as an adult, the historical details were largely irrelevant to the emotional and psychological story he had told. The documents mattered to historians and political commentators more than to the family narrative the memoir had already established.