Please answer the following question: Robert L. Bob Buch (born July 24 1949) was a Democratic member of the Alaska House of Representatives representing the 27th District from 2007 to 2011. Buch was elected in November 2006 defeating Republican opponent Tom Moffatt 56.57% to 43.25%. In 2008 Buch won reelection defeating Republican challenger Bob Lewis by 72 votes. Buch was defeated in November 2010 by Republican challenger Mia Costello. 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