Canadian Floor Crossers

Crossing the Floor: A Canadian Political Tradition

Floor crossing is one of Canada's most dramatic political traditions. When an MP walks across the House of Commons to join a different party, it represents both political calculation and personal conviction, often triggering controversy about democratic representation and voter trust.

Since Confederation, 132 MPs have crossed the floor, with varying degrees of success. Some, like David Emerson (Liberal to Conservative, 2006), sparked national outrage. Others, like Scott Brison (Progressive Conservative to Liberal, 2003), built successful long-term careers in their new party. And in the span of just five months - November 2025 through April 2026 - five opposition MPs have joined the Liberals, putting Prime Minister Mark Carney one seat away from a majority government, with three byelections on April 13 that could push him over the line.

Net Party Gains and Losses from Floor Crossing

Which parties have been the biggest winners and losers from floor crossing throughout Canadian parliamentary history. The 2025-26 wave of Carney-era crossings has pushed the Liberal net figure to its highest point ever.

Complete Party Movement Analysis

A breakdown of every party's floor crossing gains and losses since Confederation. The Liberals have been the biggest net winners by a wide margin - a position reinforced decisively by the current wave of Carney-era crossings.

Electoral Consequences: Do Floor Crossers Win or Lose?

The harsh reality of crossing the floor: most MPs who switch parties struggle to win reelection in their new partisan colours.

Why MPs Cross the Floor

The motivations behind Canada's most dramatic political decisions, from policy disagreements to personal ambition.

Timeline: The Most Dramatic Floor Crossings

Complete Historical Record of Canadian Floor Crossers

Every documented floor crossing in Canadian parliamentary history, with electoral outcomes and career impacts. Rows highlighted in gold are the five recent crossings to the Carney Liberals (2025-26).

The 2025-26 Carney Wave: Five Crossings in Five Months

The concentrated wave of floor crossings to the Carney Liberals is without modern precedent. Five opposition MPs joining a single government caucus in a five-month span has reshuffled the balance of power in real time - and put Carney one seat away from a majority he was denied at the ballot box.

Conservative leader Pierre Poilievre has characterized the crossings as "dirty backroom deals" to seize a majority the Liberals were denied at the ballot box. Poilievre said of Gladu's crossing: "Mark Carney is seizing a costly Liberal majority that voters denied him, and doing so through backroom deals." The Liberals counter that MPs are following their conscience at a critical moment for Canadian sovereignty and economic policy under the shadow of US tariffs. An Angus Reid poll found only 26% of Canadians believe floor crossers should be allowed to finish their term with their new party, while 41% say they should face a byelection. Notably, 78% of recent Conservative voters now say floor crossing should be banned - a dramatic reversal from 2018, when a majority of CPC voters supported the practice.

The Gladu crossing drew particular attention for the sheer gap between her past positions and Liberal values. She had been a vocal opponent of vaccine mandates during COVID-19, once promoted hydroxychloroquine as a treatment when it was unproven, and had publicly stated that floor crossers should step down and run in byelections. AI Minister Evan Solomon, who helped bring Gladu across, told reporters: "This is a pragmatic moment." Carney insisted she would "vote with the government" on social issues.

The three byelections scheduled for April 13 - in University-Rosedale (Toronto), Scarborough Southwest (Toronto), and Terrebonne (Quebec) - are widely expected to deliver at least one Liberal win, which combined with Gladu's crossing would push the party to 172 seats and a thin majority. The Terrebonne riding remains competitive after the Bloc Quebecois challenged a one-vote Liberal win from the 2025 federal election all the way to the Supreme Court.

The Most Successful Floor Crossers in Canadian History

While most floor crossers struggle electorally, a select few have not only survived but thrived in their new political homes.

Success Factors: The most successful floor crossers share common characteristics: they cross early in their careers, have strong constituency connections, articulate clear policy reasons for switching, and often cross to parties that are rising in popularity. Conversely, high-profile crossings for perceived personal gain typically fail with voters.

When and Where Floor Crossing Happens

Geographic Patterns: Quebec leads historically due to its unique political dynamics and the sovereignty movement. The 1990s saw massive movement as the PC party collapsed. The current Carney-era crossings are notable for their geographic diversity - Nova Scotia (d'Entremont), Toronto (Ma), Edmonton (Jeneroux), Nunavut (Idlout), and southern Ontario (Gladu, Sarnia) - suggesting national, not regional, motivations.

The Verdict: Political Courage or Betrayal?

Canadian floor crossing represents the tension between party loyalty and personal conscience in parliamentary democracy. While some crossings reflect genuine policy disagreements or evolving political convictions, others appear motivated by ambition or opportunism - and voters tend to know the difference.

The electoral data is unambiguous: voters generally punish floor crossers. Only about a third of crossers win reelection, and many retire rather than face voter judgment. The Angus Reid Institute's polling after the current wave found that only 26% of Canadians believe a crossing MP should be allowed to stay in their seat. Most want a byelection, an independent period, or the seat vacated entirely.

The current wave of crossings to the Carney Liberals - five in five months - is unprecedented in its concentration and its political consequence. With Marilyn Gladu's April 8 crossing putting the Liberals at 171 seats, the party needs just one byelection win on April 13 to reach a majority it was denied at the polls in 2025. Whether that constitutes democratic pragmatism or democratic manipulation is a debate Canadians will be having for years. What isn't debatable is that d'Entremont, Ma, Jeneroux, Idlout, and Gladu have each made a bet that history says is more likely to end in defeat than vindication. The voters, as always, will have the final word.

Sources and Methodology

Floor crossing data compiled from Parliamentary records, Elections Canada databases, newspaper archives, parliamentary libraries, and academic studies of Canadian political behaviour. Data on the 2025-26 Carney-era crossings sourced from CBC News, CTV News, CP24, Globe and Mail, Radio-Canada, and Global News (April 2026). Angus Reid Institute floor crossing poll (March 2026). Electoral outcomes tracked through official election results. Data covers federal MPs only, from Confederation (1867) through April 12, 2026.