Q:George William Norris (July 11 1861 September 2 1944) was a U.S. politician from the state of Nebraska and a leader of progressive and liberal causes in Congress. He served five terms in the United States House of Representatives as a Republican from 1903 until 1913 and five terms in the United States Senate from 1913 until 1943 four terms as a Republican and the final term as an independent. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Office Holder