10 of 22: This undated photo released by Obama for America shows a Barack Obama teaching at the University of Chicago Law School. After Harvard Law School, Obama returned to Chicago, ran a voter registration drive, joined a small civil rights firm, and lectured on constitutional law at the University of Chicago Law School. He and his wife, Michelle, lived in Hyde Park, the racially mixed neighborhood around the University of Chicago that is home to progressive politics, intellectuals and a sprinkling of Nobel Prize winners. (AP Photo/Obama for America, File)

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