 Rodier moved to L'Assomption; he was elected to the Legislative Assembly of Lower Canada for that region in an 1832 by-election held after Barthélemy Joliette was appointed to the legislative council.Rodier was reelected in 1834.As a radical member of the parti patriote, he supported an elected legislative council, the creation of a French Canadian republic, the end of seigneurial tenure and ending trade with Great Britain.