All Floor Crossings

Lori Idlout

2026Notable

New Democratic Party → LiberalMPNunavut

3/5

Idlout, NDP MP for Nunavut, crossed to the Liberals in early 2026, joining the governing party to better advocate for Inuit and northern issues from within government.

Marilyn Gladu

2026Notable

Conservative → LiberalMPOntario

3/5

Gladu was the fourth Conservative MP to cross the floor to the Liberals during the 45th Parliament. A veteran MP first elected in 2015, she joined Prime Minister Mark Carney's g…

Sandra Jansen

2016Notable

Prog. Conservative → NDPMLAAlberta

3/5

Jansen was a Progressive Conservative who crossed all the way to the left-wing NDP - one of the rarest types of crossing. She cited harassment she experienced during the PC lead…

Lane, PC MHA for Mount Pearl South, crossed to the Liberals in 2014 ahead of the anticipated Liberal wave.

Bridget Pastoor

2011

Alberta Liberal → Progressive ConservativeMLAAlberta

3/5

Pastoor, Alberta Liberal MLA for Lethbridge-East, left the Liberals and crossed to the PCs under new leader Alison Redford, who she felt represented a more progressive direction.

Guy Boutilier

2010

Progressive Conservative → WildroseMLAAlberta

3/5

Boutilier, Alberta PC MLA for Fort McMurray-Wood Buffalo, was ejected from the PC caucus in 2009 for publicly criticizing the government's response to the oilsands housing crisi…

Heather Forsyth

2010Notable

Progressive Conservative → Wildrose AllianceMLAAlberta

3/5

Forsyth, a long-serving PC MLA and former cabinet minister, crossed to the Wildrose Alliance with Rob Anderson over dissatisfaction with PC governance.

Anderson, PC MLA for Airdrie-Chestermere, crossed to the Wildrose Alliance along with Heather Forsyth, citing overspending, broken promises, and democratic reform.

Bill Casey

2007Notable

Conservative → IndependentMPNova Scotia

3/5

William David "Bill" Casey, the Conservative MP for Cumberland—Colchester—Musquodoboit Valley in Nova Scotia, was expelled from the Conservative caucus on June 6, 2007, after vo…

Mark, MP for Dauphin-Swan River, was part of the DRC dissident group within the Canadian Alliance. He left and eventually joined the Progressive Conservatives.

Joe Peschisolido

2002

Canadian Alliance → LiberalMPBritish Columbia

3/5

Peschisolido, Alliance MP for Richmond, crossed to the Liberals citing dissatisfaction with the Alliance's direction under Stephen Harper.

In the summer of 2001, approximately fourteen Canadian Alliance MPs — including Deborah Grey (the party's first-ever MP), Chuck Strahl, Grant McNally, Val Meredith, Jay Hill, Ji…

Harvey crossed from the PCs to the Liberals in 2000, dissatisfied with the party's direction under Joe Clark.

St-Jacques joined the Liberal Party along with other Quebec PC MPs who were unhappy with the party's direction.

Laliberte, NDP MP for Churchill River, crossed to the Liberals in 2000, reportedly for better access to government resources for his northern riding.

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.

Julé, Saskatchewan Liberal MLA for Humboldt, left the Liberals to join the newly formed Saskatchewan Party, which united the right against the NDP.

Gilles Bernier, a Progressive Conservative MP for Beauce since 1984, was a colourful Quebec politician who ran as an Independent in the October 1993 election after being denied …

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…

David Kilgour

1990Notable

Prog. Conservative → IndependentMPAlberta

3/5

Kilgour left the Conservatives over policy disagreements. He later joined the Liberals. Then in 2005, he left the Liberals too - one of only two people to cross the floor twice.

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…

Leblanc was a PC MP who joined the Bloc Québécois as a founding member after the collapse of the Meech Lake Accord.

Jacques Lavoie, a Progressive Conservative MP from Quebec, crossed the floor to join the Liberal Party in 1977. His switch came during a period of intense political flux in Queb…

Frank Calder

1975Notable

NDP → Social CreditMLABritish Columbia

3/5

Calder was the first Indigenous person elected to any legislature in Canada, serving 26 years as a CCF/NDP member. He crossed to Social Credit, the governing party.