Please answer the following question: Thomas Kean Jr. - Thomas Howard Tom Kean Jr. (born September 5 1968) is an American Republican politician serving in the New Jersey State Senate since 2003. He represents the 21st Legislative District which covers parts of Union Morris Somerset and Essex Counties. On November 8 2007 he was elected to serve as Minority Leader of the Senate. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Office Holder