 Many of his ideas are inspired by Guillaume Groen van Prinsterer, the intellectual father of the Antirevolutionary Party; Kuiper wrote a biography of Groen in 2001.Kuiper has been a Christian Union member of the Senate from 12 June 2007 to 11 June 2019.He has been Senate group leader from 7 June 2011 to 11 June 2019, succeeding Egbert Schuurman.