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More than 2,000 graduates at American University heard speeches from the U.S. Senate's most senior Republican, Richard G. Lugar, moderator of CBS Face the Nation, Bob Schieffer, National Medal of Science recipient Vera C. Rubin, Gene Sperling, director of the National Economic Council, and Peace Corps Director Aaron S. Williams at AU’s 125th main commencement ceremonies on May 7 and 8. Watch the speeches and highlight videos of the weekend's commencement ceremonies.