Given the question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. David Johnson (Iowa politician) -  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.
The answer is:
Office Holder