Book Examines Varied 'Tapestry' of Michelle Obama's Ancestry

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When Rachel Swarns began research on First Lady Michelle Obama's American lineage, she discovered remarkable family sagas, including the story of Mrs. Obama's white great-great-great-grandfather. Gwen Ifill talks to New York Times' Rachel Swarns about her new book on the genealogy of Michelle Obama, "American Tapestry."