Liberal By‑Election Sweep Gives Mark Carney a Majority Without a General Vote

Prime Minister Mark Carney’s Liberals have turned a minority government into a majority without a general election, after sweeping three federal by‑elections Monday that pushed the party over the line in the House of Commons.

Liberal victories in University—Rosedale and Scarborough Southwest in Toronto, and Terrebonne near Montreal, lift the party to 174 of 343 seats — two above the 172 needed for a majority — less than a year after voters stopped short of granting Carney one in the April 28, 2025, general election.

The results give the Liberals the numbers to pass legislation without relying on opposition parties and, barring extraordinary circumstances, to govern until 2029. They also intensify a debate over the optics of what opposition leaders are calling a “manufactured” or “costly” majority assembled through a mix of defections and low‑turnout contests.

Wire services including The Associated Press and Reuters report this is the first time at the federal level that a Canadian government has moved from minority to majority status between elections.

The immediate gains are straightforward. In University—Rosedale, family physician and health‑sector figure Danielle Martin held a downtown Toronto seat vacated when former deputy prime minister Chrystia Freeland resigned earlier this year to advise Ukraine. In Scarborough Southwest, former Ontario New Democratic Party legislator and ex‑deputy leader Doly Begum won the seat left open when former cabinet minister Bill Blair became Canada’s high commissioner to the United Kingdom in February.

In Terrebonne, Liberal Tatiana Auguste reclaimed a riding she had first won by a single vote in 2025. That razor‑thin result was annulled by the Supreme Court of Canada on Feb. 13 over an Elections Canada mail‑in ballot and envelope error, forcing a new vote. Auguste won again on Monday, reportedly by a wider margin, fending off another challenge from the Bloc Québécois in a symbolically important contest for federalist forces in Quebec.

Turnout in at least two of the races was modest. Local reporting citing Elections Canada put participation at about 33.5% in Scarborough Southwest and around 32% in University—Rosedale, levels typical of by‑elections but well below general election turnout.

Those three new MPs join a Liberal caucus already swelled by a string of high‑profile floor crossers from opposition parties in late 2025 and early 2026. The April 2025 election had left the Liberals with 169 seats, short of a majority. A series of defections — described by Reuters and others as unusually numerous and rapid in modern Canadian politics — lifted the party to 171 seats by early April, one shy of a majority even before Monday’s votes.

Among the defectors was Conservative MP Marilyn Gladu, who joined the Liberals on April 8. Explaining her move, Gladu said, “We need a global leader with a plan to make a more resilient Canada, a stronger Canada, a more self‑reliant Canada for this critical moment and that man is our Prime Minister Mark Carney.”

Carney, a former governor of both the Bank of Canada and the Bank of England, became Liberal leader on March 9, 2025, and was sworn in as prime minister five days later, weeks before leading the party to its minority win.

With Monday’s by‑election sweep, his government now holds a clear majority of seats. That changes the balance of power in Ottawa in concrete ways. The Liberals can advance budgets and key bills without negotiating support from other parties, and they control the timing of the next election within Canada’s fixed‑date framework, which sets the next vote for 2029 unless the government falls earlier.

Analysts and business groups have linked Carney’s push for a stronger parliamentary foothold to his agenda on trade and industrial policy, including how Canada responds to U.S. tariffs and broader economic and security legislation. A majority lowers the risk that signature measures could be blocked or significantly rewritten by opposition parties.

The path to that majority, however, is already becoming a political weapon for Carney’s rivals.

Conservative leader Pierre Poilievre has argued that the government’s new status lacks a fresh mandate from voters across the country, pointing to the combination of floor crossings and localized, low‑participation by‑elections.

He accused Carney of “seizing a costly Liberal majority that voters denied him, and doing so through backroom deals.”

The criticism is political rather than legal; Canada’s parliamentary system allows MPs to switch parties and permits governments to gain or lose majority status between elections as seats change hands. The three new Liberal MPs won in races called under federal law after resignations or a court‑ordered rerun, and all were decided by local voters.

Still, the speed and scale of the realignment have few contemporary parallels, with wire reports drawing comparisons to earlier eras of dominant majority governments under prime ministers John A. Macdonald and Jean Chrétien.

For the Bloc Québécois, Monday’s outcome in Terrebonne underscores a different concern: the convergence of Canada’s two largest national parties. Bloc leader Yves‑François Blanchet said “the ideological differences between the Liberals and Conservatives are getting thinner and thinner by the minute,” arguing that Quebecers opposed to both parties risk being marginalized in a Parliament now firmly controlled by the Liberals.

The months ahead will test how Carney uses his new majority — and whether voters outside the three by‑election ridings accept a government that crossed the majority threshold not at a general election, but seat by seat, between them.