Story perspectives

Ontario MP Michael Ma Joins Liberals, Shakes Up Politics

12/12/2025

Summary

Story summary

Ontario MP Michael Ma defected from the Conservative Party to join Prime Minister Mark Carney's Liberal Party on December 11, 2025, leaving the Liberals one seat short of a majority.
Ma, representing Markham–Unionville, said his focus is on solutions and unity.
Conservative Leader Pierre Poilievre criticizes the move as betraying constituents, a stance that follows Nova Scotia MP Chris d’Entremont's switch to the Liberals and complicates his January leadership review.

History

Historical Context

The 2015 Canadian federal election, held on October 19, marked a historic shift as Justin Trudeau's Liberal Party won 184 seats, a gain of 148 from the previous election. This victory ended nearly a decade of Conservative rule under Stephen Harper, who dropped to 99 seats. The election also saw the highest voter turnout since 1993, reflecting significant political realignment in Canada.

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Story summary

Ontario MP Michael Ma defected from the Conservative Party to join Prime Minister Mark Carney's Liberal Party on December 11, 2025, leaving the Liberals one seat short of a majority.
Ma, representing Markham–Unionville, said his focus is on solutions and unity.
Conservative Leader Pierre Poilievre criticizes the move as betraying constituents, a stance that follows Nova Scotia MP Chris d’Entremont's switch to the Liberals and complicates his January leadership review.

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