 Nyorai mberi kweiyi ndima - Erwin akasarudzwa neLiberal Party senhengo yeImba yeVamiriri chigaro cheBallaarat musarudzo dza1955. Akanga ari Whip weHurumende kubva munaFebruary 1967 kusvika munaFebruary 1969 uye akatsigira zvakasimba kusarudzwa kwaJohn Gorton semutungamiri weLiberal zvichitevera kutsakatika uye kufungidzirwa kunonyuraMutungamiriri wehurumende Harold Holt musi wa17 December 1967. Musi wa13 Kukadzi 1969 akagadzwa Gurukota reMhepo, mukushandurwazve kwakatevera kugadzwa kwaPaul Hasluck saGavhuna-General. Gorton akazogadza mumwe wevashandi vake vaduku, Ainsley Gotto semunyori wake oga uye akauya kuzovimba naye nokuda kwezano rezvematongerwe enyika. Muna November 1969, Erwin akasiyiwa kunze kwoushumiri hwechipiri hwaGorton. Tsananguro yaErwin yokudzingwa kwake yaiva yokuti: Erwin akatungamirira Joint Select Committee on Parliamentary and Government Publications, iyo yakabudisa chinyorwa chokutanga cheAustralian Government Style Manual. Akasiya basa muparamende musarudzo dza1975. Kusarudzwa kwake kwekupedzisira kwezvematongerwe enyika kwakaitika musarudzo dza1979 dzeAustralia Capital Territory House of Assembly, kwaakamhara zvisina kubudirira semunhu akazvimirira. 