Gauthier served as a city councillor from 1950 to 1953, as Mayor from 1955 to 1972 and as school board member from 1959 to 1963 in Saint-Michel-des-Saints.
He ran as a Union Nationale candidate in the 1966 election in the provincial district of Berthier and won.
Gauthier served as his party's Deputy House Whip from 1966 to 1972.
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