Once in Parliament, Campion quickly became associated with Michael Laws, Hamish MacIntyre and Gilbert Myles in objecting to the monetarist policy of Ruth Richardson, known as Ruthanasia, which the fourth National Government was following.
He voted against the 1991 "Mother of all Budgets" and was publicly critical of National's decision to break their election promise to remove the superannuation surcharge.
[3] He announced his resignation from the National Party on 3 March 1993, and accused the party of attempting to rig the re-selection process against him also labeling Prime Minister Jim Bolger as arrogant and intimidating and sick of his style of leadership which ignored opinions in caucus.
[4] Campion remained an Independent for the remainder of his term, up to the 1993 general election in November when he was defeated.
[2] Before leaving parliament he drafted a private members bill to legalise voluntary euthanasia.