📌 The Canadian federal electoral district of Châteauguay—Saint-Constant was contested in the 2004 election.

🏆 Denise Poirier-Rivard, the Bloc Québécois candidate, won the riding with 28,991 votes (57.3% of the vote).

🥈 The runner-up was Robert Lanctôt (Liberal) with 15,208 votes (30.1%), defeated by a margin of 13,783 votes.

📊 Other notable candidates: Rosaire Turcot (Conservative, 6%).