Floor Crossings Give Carney's Liberal Party House Majority in Canada

In fewer than five months, Prime Minister Mark Carney has done something no Canadian leader has accomplished in modern memory: transformed a minority government into a functional majority without calling a single voter to the polls. Through a steady drumbeat of four floor crossings — three Conservative MPs and one New Democrat — Carney's Liberals now hold 170 of the 343 seats in the House of Commons, just two shy of the 172 needed for an outright majority [1]. With three byelections called for April 13, the finish line is in sight.

But the strategy has triggered one of the most contentious democratic debates in recent Canadian politics: Can a prime minister legitimately build a majority through recruitment rather than election?

The Four Defections

The exodus began in November 2025, when Nova Scotia MP Chris d'Entremont became the first Conservative to cross the floor to the Liberals. D'Entremont later told CBC that Conservative House leader Andrew Scheer and party whip Chris Warkentin had "barged" into his office and "yelled at him about how much of a snake" he was — an encounter he said "sealed the deal" on his decision to leave [2]. He cited Carney's leadership on national priorities and the direction of the Liberal government's budget as motivating factors.

In December, Markham-Unionville MP Michael Ma followed, issuing a statement that avoided directly criticizing Conservative leader Pierre Poilievre but declared: "I entered public service to help people — to focus on solutions, not division" [3].

The third defection proved the most dramatic. On February 18, Edmonton MP Matt Jeneroux — who had initially announced he was leaving politics entirely, citing family reasons — reversed course and joined the Liberal caucus. Jeneroux pointed to Carney's speech at the World Economic Forum in Davos, where the prime minister declared that the rules-based world order had experienced "a rupture, not a transition" and called on middle powers to unite against coercion. "I think it opened a lot of eyes for Canadians, Albertans, Edmontonians, just how serious this national unity crisis truly is," Jeneroux said, "and for me it felt disingenuous and quite simply wrong to be sitting on the sidelines anymore" [4].

Then on March 11, NDP MP Lori Idlout of Nunavut became the fourth defector — and the first from outside the Conservative ranks. Idlout cited Arctic sovereignty, Indigenous rights, and climate change as her reasons for joining the government, framing the move as pragmatic rather than ideological [5]. Her departure left the NDP with just six MPs, its smallest caucus in decades.

Source: House of Commons of Canada

Data as of Mar 15, 2026CSV

The Path to 172

Carney has now called byelections in three ridings for April 13, 2026 [6]. Two are in Toronto — University-Rosedale, vacated when Chrystia Freeland left to become an adviser to Ukrainian President Volodymyr Zelenskyy, and Scarborough Southwest, left open after Bill Blair was appointed Canada's high commissioner to the United Kingdom. Both are considered strong Liberal territory.

The third contest is far less certain. In the Quebec riding of Terrebonne, the Liberals won by a single vote in the April 2025 election, only to have the Supreme Court nullify the result after a mail-in ballot was improperly excluded. The rematch against Bloc Québécois candidate Nathalie Sinclair-Desgagné could go either way [1].

Even a Liberal sweep of all three byelections would yield only a razor-thin majority of 172 seats — and structural complications would remain. Speaker Francis Scarpaleggia, a Liberal MP who acts as an impartial presiding officer, only votes in the event of a tie, and convention dictates that the Speaker votes to preserve the status quo. This means the Liberals would still need at least one opposition vote to pass legislation in many scenarios [1]. Committee compositions, moreover, remain frozen from the start of the parliamentary session, with Conservatives holding roughly equal representation.

A Historic Pace

Four floor crossings to the governing party in four months is rare but not unprecedented in Canadian history. Prime Minister Jean Chrétien scooped up four opposition MPs in less than a month in 2000 — one NDP, two Progressive Conservatives, and one Independent — though Chrétien already held a comfortable majority and didn't need the additional seats [7]. Sir John A. Macdonald holds the all-time record with nine opposition MPs crossing to join his government during the first Parliament, five on the same day in 1869, though those defections came from the collapsing Anti-Confederation Party [7].

What makes Carney's achievement distinct is the context: a minority prime minister methodically assembling a majority through individual recruitment, each defection moving the needle toward functional control of the House.

Source: GDELT Project

Data as of Mar 15, 2026CSV

The Democratic Debate

The floor-crossing blitz has ignited a fierce debate over democratic legitimacy. Conservative leader Pierre Poilievre has been the most vocal critic, telling the CBC's Rosemary Barton: "My message to Mark Carney is that if you want a costly majority government … then you have to go to the Canadian people and have them vote for it, not do it by dirty backroom deals" [8].

There is a conspicuous irony in Poilievre's position. In 2012, he was among the Conservative MPs who voted against an NDP private member's bill that would have required floor-crossers to run in a byelection before switching parties [9]. The Conservatives also welcomed high-profile defectors during their own time in government, including former Liberal MPs David Emerson (2006), Wajid Khan (2007), and Leona Alleslev (2018).

Public opinion, however, leans toward the critics. An Angus Reid Institute poll released on March 11 found that only 26% of Canadians believe an MP who crosses the floor should be allowed to serve out their term with their new party. A plurality — 41% — said floor-crossers should be required to step down and win a byelection, while 22% said they should sit as independents until the next general election [10].

The partisan divide is stark. Among Conservative voters, only 14% support allowing floor crossings, down from 57% in 2018 — a near-total reversal driven by the experience of watching their own MPs leave. Among Liberal voters, 69% support the practice. NDP voters, despite just losing one of their few remaining members, also support it at 69% [10].

Source: Angus Reid Institute

Data as of Mar 11, 2026CSV

The Broader Context: Trump, Tariffs, and National Unity

The floor crossings cannot be understood in isolation from the broader geopolitical pressures facing Canada. President Donald Trump's tariff threats and repeated suggestions about making Canada the "51st state" have generated a wave of Canadian nationalism that Carney has ridden with remarkable skill [11]. His Davos speech in January 2026, which earned praise across the political spectrum in Canada, explicitly framed the country's challenge as one of sovereignty and independence in a world where the old order had ruptured [12].

Carney's approval rating has climbed steadily, reaching 66% as of mid-March — bolstered by what pollsters have called a "Davos bump" and sustained by his muscular posture on sovereignty [13]. The Liberals lead the Conservatives 43% to 34% in voting intention, according to Liaison Strategies tracking, with some polls showing even wider margins [14]. A Nanos Research survey found 57% of Canadians chose Carney as the best choice for prime minister, compared to just 22% for Poilievre [13].

This political environment has created conditions uniquely favorable to floor crossing. The defectors have framed their moves not as acts of opportunism but as responses to a national emergency — an argument that resonates with the Canadian public's current mood but does not necessarily answer the democratic objections.

What History Tells Us About Floor-Crossers

CBC News tracked every federal MP who crossed the floor since 2004, finding that the path across the aisle is "often a precarious one" [15]. Of the 131 documented floor-crossers in Canadian history, only 42 — roughly 32% — won reelection in their new party. Another 17 retired before facing voters, while 68 were defeated.

Since the 1970s, the electoral cost of switching has risen dramatically. As parties have become more institutionalized and constituency associations more powerful, voters have increasingly punished defectors. Belinda Stronach famously survived her 2005 crossing from the Conservatives to the Liberals, retaining her Newmarket-Aurora seat in 2006 before retiring. But Wajid Khan, who crossed from the Liberals to the Conservatives in 2007, was resoundingly defeated by his voters in the subsequent election [15].

For Carney's four recruits, the historical odds are not encouraging. But the unusual political climate — with national unity concerns dominating public discourse and Carney's personal popularity running high — may offer some insulation against voter backlash.

The NDP's Existential Crisis

Idlout's defection has compounded what was already a dire situation for the NDP. Reduced to just seven seats in the April 2025 election — its worst showing in decades — the party now holds only six under interim leader Don Davies. Davies issued a pointed statement: "We're very disappointed that Lori Idlout has decided to join the Liberal caucus. The position of the New Democrats on floor crossing is longstanding and clear. We believe that when someone rejects the decision of their electors and wants to join another party, they should put that decision to their voters" [5].

The NDP's long-standing opposition to floor crossing without a byelection — the party has introduced legislation to mandate it multiple times — gives it a more consistent position than either the Liberals or Conservatives, who have alternately embraced and condemned the practice depending on which side of the exchange they were on.

What Comes Next

The April 13 byelections will determine whether Carney's majority strategy succeeds. Victory in the two Toronto ridings is widely expected; the Terrebonne contest will be the true test. Even if the Liberals win all three, governing with a one-seat margin — effectively a majority of zero after accounting for the Speaker — will require discipline that few Canadian governments have sustained.

The deeper question is whether the floor-crossing path to majority damages the democratic compact between voters and their representatives. Canada's Westminster parliamentary system has always permitted floor crossing — there is no constitutional or statutory requirement for MPs to remain with the party under which they were elected. But the fact that something is legal has never settled the question of whether it is legitimate.

For now, Carney's strategy is working. His poll numbers are strong, the defectors appear to have calculated correctly about the national mood, and the opposition is in disarray. Whether that calculus holds through byelections, through committee votes, and through the grinding daily business of a Parliament operating on the thinnest of margins will determine whether this experiment in majority-building by recruitment proves to be a stroke of political genius — or a shortcut that stored up trouble for the road ahead.