Q:Tracy Potter (born June 23 1950) is a historian and North Dakota politician of the North Dakota Democratic-NPL Party. He represented District 35 in the North Dakota Senate from 2007 to 2011 and was the endorsed candidate for U.S. Senate in the 2010 election against Governor John Hoeven. He now serves as executive director of The Fort Abraham Lincoln Foundation.Potter earned BA and MA degrees in History from the University of North Dakota. 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