David Johnson is the Iowa State Senator from the 3rd District and is an assistant minority leader. A Republican he has served in the Iowa Senate since 2003 and served in the Iowa House of Representatives from 1999 2003. He received his B.A. 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