** FILE ** In this Nov. 4, 2008 file photo, President-elect Barack Obama, left, his wife Michelle Obama, right, and two daughters, Malia, and Sasha, center left, wave to the crowd at the election night rally in Chicago. HBO has bought the U.S. rights to a behind-the-scenes documentary on Barack Obama's presidential campaign from actor Edward Norton's production company. Filming will continue through the president-elect's inauguration, with the premiere expected sometime in the spring, the network said Friday. (AP Photo/Jae C. Hong, file)