 In 1984, he unsuccessfully sought a seat in federal parliament with the Parti nationaliste du Québec.Dubé was elected in the Lévis electoral district under the Bloc Québécois party in the 1993, 1997 and 2000 elections, serving in the 35th, 36th and 37th Canadian Parliaments respectively.The riding was renamed Lévis-et-Chutes-de-la-Chaudière in 1998, during his second term of federal office.