He subsequently entered politics and was defeated in his attempt to win a seat in the House of Commons of Canada in the 1988 election. He was elected on his second attempt in the 1993 election as the Liberal Member of Parliament for Laval West. He immediately joined the Cabinet, serving concurrently as Minister of Communications and Minister of Multiculturalism and Citizenship from 1993 until January 1996. During his tenure, the departments he oversaw were merged into the new Department of Canadian Heritage
Dupuy came under fire for "representing a constituency in a Canadian Radio-television and Telecommunications Commission (CRTC) application" because he was the minister responsible for the agency, and was subsequently dropped from Cabinet.
He did not run in the 1997 election.
|1993 Canadian federal election: Laval West|
|Bloc Québécois||Michel Leduc||26,460||43.01||$44,789|
|Progressive Conservative||Guy Ricard||4,167||6.77||$59,586|
|New Democratic Party||Marcella Tardif-Provencher||678||1.10||$2,926|
|Natural Law||Eddy Gagné||546||0.89||$270|
|National||Cyril G. MacNeil||280||0.46||$4,218|
|Total valid votes||61,525||100.00|
|Total rejected ballots||1,765|
|Electors on the lists||79,486|
|Source: Thirty-fifth General Election, 1993: Official Voting Results, Published by the Chief Electoral Officer of Canada. Financial figures taken from official contributions and expenses provided by Elections Canada.|
- "Canada wins new air routes to U.S. cities". Montreal Gazette. 11 September 1973. p. 1. Retrieved 11 February 2011.
- "Canada Supports Israel In Un Vote On Occupied Territories". Ottawa Citizen. 30 July 1980. p. 64. Retrieved 11 February 2011.