All Floor Crossings

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…

Ma was the second Conservative MP to cross to the Liberals. His crossing was especially significant because it brought the Liberals within just one seat of a majority government…

Amanda Simard

2020Notable

Prog. Conservative → LiberalMPPOntario

1/5

Simard resigned from Doug Ford's Ontario PC caucus because the government cut funding for Franco-Ontarian services - including eliminating the French Language Commissioner. She …

Leona Alleslev

2018Notable

Liberal → ConservativeMPOntario

2/5

Alleslev left the governing Liberals for the opposition Conservatives, citing concerns about economic and defence policy. This is unusual - most people cross TO the governing pa…

MacLaren, Ontario PC MPP for Carleton-Mississippi Mills, was expelled from the PC caucus after making offensive comments about francophones. He briefly associated with the Trill…

Adams, Conservative MP for Mississauga-Brampton South, crossed to the Liberals in February 2015 after being denied a Conservative nomination. She was personally welcomed by Just…

Dean Del Mastro

2013Notable

Conservative → IndependentMPOntario

0/5

Del Mastro had been one of PM Harper's closest allies - his parliamentary secretary. He left caucus after being charged by Elections Canada with overspending on his campaign and…

Bruce Hyer

2012Notable

New Democratic Party → Green PartyMPOntario

1/5

Hyer, NDP MP for Thunder Bay-Superior North, left the NDP in 2012 over the party's whipped vote on the long-gun registry. He sat as an independent before joining the Greens in 2…

Garth Turner

2007Notable

Conservative → LiberalMPOntario

1/5

Turner was expelled from the Conservative caucus in October 2006 for publicly criticizing the party. After sitting as an independent, he joined the Liberals in February 2007.

Joseph R. "Joe" Comuzzi, a Liberal MP from Thunder Bay—Superior North since 1988, was suspended from the Liberal caucus in March 2007 after voting in favour of the Harper Conser…

Peterson, Ontario Liberal MPP for Mississauga South, left the Liberals in March 2007 over policy disagreements and joined the PCs in June 2007.

Khan, Liberal MP for Mississauga-Streetsville, crossed to the Conservatives in January 2007 after Prime Minister Harper appointed him as special adviser on Middle East and South…

Belinda Stronach

2005Notable

Conservative → LiberalMPOntario

5/5

In one of the most dramatic moments in Canadian parliamentary history, Stronach crossed the floor to join Paul Martin's Liberal cabinet. Her single vote helped save the minority…

O'Brien left the Liberal caucus over the government's same-sex marriage legislation, sitting as an independent.

Cools, a Liberal senator since 1984, crossed to the newly formed Conservative Party in 2004 over her opposition to same-sex marriage legislation. She was the first Black Canadia…

Carolyn Parrish

2004Notable

Liberal → IndependentMPOntario

0/5

Parrish was expelled from the Liberal caucus after publicly insulting Prime Minister Paul Martin and famously stomping on a George W. Bush doll on a comedy TV show.

Bryden, Liberal MP for Ancaster-Dundas-Flamborough-Aldershot, crossed to the newly formed Conservative Party in 2004, disagreeing with Liberal policies.

Jim Jones

2000

Progressive Conservative → Canadian AllianceMPOntario

0/5

Jim Jones, a Progressive Conservative MP for Markham in Ontario, defected to the newly formed Canadian Alliance in September 2000. Jones had been expelled from the PC caucus in …

Castrilli, Ontario Liberal MPP for Downsview, crossed to the PCs after losing her Liberal nomination due to riding redistribution. She joined the governing party of Mike Harris.

Cullen, Ontario Liberal MPP for Ottawa West, left the Liberals to join the Ontario NDP, citing disagreements over the party's direction on social policy.

John Nunziata

1996Notable

Liberal → IndependentMPOntario

0/5

In 1993, the Liberals won a huge election partly by promising to eliminate the GST (sales tax). Once in power, they broke that promise. Nunziata voted against his own party's bu…

Bhaduria was removed from the Liberal caucus after controversy over falsified educational credentials and a previous court case. He sat as an independent, styling himself a "Lib…

Dennis Drainville

1993

Ontario NDP → IndependentMPPOntario

0/5

Drainville, Ontario NDP MPP for Victoria-Haliburton, quit the NDP caucus to sit as an independent to protest the Rae government's decision to allow casino gambling in Ontario.

Ramsay, Ontario NDP MPP for Timiskaming, left the NDP to join the Ontario Liberals under David Peterson.