In his novel The Prime Minister, the fifth in the Palliser series, Anthony Trollope has Plantagenet Palliser, the Duke of Omnium, enunciate his political credo. The Duke explains to Phineas Finn, who recently defended him in the House of Commons from the charge that he tried to purchase a seat for one of his supporters, that the belief that “political virtue is all on one side is both mischievous and absurd.