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Every documented case of a Canadian MP, MPP, MLA, MNA, or MHA switching parties — federal and provincial, 1867 to present. Filter by level, province, or category.
Bernier narrowly lost the Conservative leadership race to Andrew Scheer (by less than 2%). Bitter about the loss, he left to start his own party - the People's Party of Canada -…
Fortin left the BQ to co-found the Strength in Democracy (Force et Démocratie) party with Jean-François Larose, seeking a new approach to Quebec nationalism.
Larose, NDP MP for Repentigny, left the NDP to co-found the Strength in Democracy (Force et Démocratie) party with Jean-François Fortin.
Four Liberal and four PC members of the Saskatchewan legislature left their parties to create a brand new party - the Saskatchewan Party - uniting the right.
In August 1997, four Liberal MLAs (Bob Bjornerud, June Draude, Ken Krawetz, and Rod Gantefoer) and four Progressive Conservative MLAs (Bill Boyd, Don Toth, Ben Heppner, and Dan …
Wilson, former BC Liberal leader, and Tyabji left the Liberals after Wilson was ousted as leader due to a personal scandal involving his relationship with Tyabji. They founded t…
François Gérin, a Progressive Conservative MP for Mégantic—Compton—Stanstead, was among the first Quebec MPs to break with Brian Mulroney over the failure of the Meech Lake Acco…
Gilles Duceppe made history on August 13, 1990, when he won the by-election in Laurier—Sainte-Marie as an Independent sovereigntist — the first explicitly pro-sovereignty candid…
Louis Plamondon, a Progressive Conservative MP for Richelieu since 1984, left the Conservative caucus in June 1990 in the wake of the Meech Lake crisis and joined the nascent Bl…
Bouchard was a cabinet minister under PM Mulroney. When the Meech Lake Accord (a constitutional deal meant to bring Quebec into the constitution) failed, Bouchard left the party…
Collver, former leader of the Saskatchewan PCs, and fellow MLA Dennis Ham left to form the Unionest Party, which controversially advocated for western Canadian provinces joining…
Thirteen Quebec-based Social Credit MPs, led by Réal Caouette, split from the national Social Credit Party to form the Ralliement des créditistes, a Quebec-focused populist part…
Maxime Raymond, a veteran Liberal MP from Quebec, founded the Bloc populaire canadien in September 1942, breaking decisively with the Liberal Party over Prime Minister Mackenzie…
During the Great Depression, Stevens investigated big companies that were exploiting workers and farmers. His own party tried to stop him. So he left and started his own party.