 Lavergne directed "Le Courrier" at Montmagny and also contributed to "Le Nationaliste", edited by Olivar Asselin, and "Le Devoir", edited by Henri Bourassa".He was elected to the House of Commons in a 1904 by-election and reelected in the general election later that year.He was expelled from the Liberal Party by Sir Wilfrid Laurier in 1907 and he resigned from his seat the following year to run for "Ligue nationaliste canadienne" in the 1908 Quebec election.