Ethnic groups: 83.9% White, 8.4% Black, 3.1% Arab, 2.0% Latin American, 1.2% Indigenous Languages: 87.9% French, 1.9% Spanish, 1.6% Arabic, 1.5% English, 1.4% Haitian CreoleReligions: 69.6% Christian (59.2% Catholic, 10.4% other), 4.7% Muslim, 25.2% none Median income: $44,800 (2020) Average income: $52,400 (2020) Repentigny had long been one of the most separatist ridings in Quebec.

Prime Minister Stephen Harper called for a by-election on October 22, 2006 with a polling day of November 27, 2006.

There had been a lot of pressure from opposition parties for Public Works Minister Michael Fortier, a Conservative senator, to run in the riding; however, he declined.

[10] The New Democratic Party candidate was union activist and former Canadian Navy member Réjean Bellemare, who had also run for the NDP in the previous general election.

Raymond Gravel of the Bloc Québécois won the by-election with an approximately two-thirds majority of votes.