6 of 10: Oprah Winfrey acknowledges the audience after she came to the stage for an interview with Ball State University alumnus David Letterman, host of CBS's "Late Show," at Ball State University in Muncie, Ind., Monday, Nov. 26, 2012. The conversation is part of the David Letterman Distinguished Professional Lecture and Workshop Series. (AP Photo/Michael Conroy) (AP Photo/ Michael Conroy)

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