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John Ensign
John Eric Ensign (born March 25, 1958) is an American veterinarian and former politician from Nevada. A member of the Republican Party, Ensign was a Congressman and United States Senator from Nevada; he served in the latter seat from January 2001 until May 2011, when he resigned amid a Senate Ethics Committee investigation into his attempts to hide an extramarital affair. Following his resignation from the Senate, Ensign returned to Nevada and resumed his career as a veterinarian.
Source: Wikipedia