OTTAWA — On Thursday, Michael Ma became the second Conservative MP to cross the floor to the Liberal caucus in as many months.

Ma’s decision to join the government, following Nova Scotia MP Chris d’Entremont’s surprise floor-crossing in early November, brought Prime Minister Mark Carney’s minority government to within one seat of a majority for the first time since the spring election. It also ramped up speculation about who might be next.

Read more: • Small group of Conservatives frustrated with Poilievre: Government House leader • Another Conservative MP crosses the floor to join Liberal caucus • Liberals confirm they courted MP for years before he quit the Conservatives

Switching parties between elections is a controversial practice. Still, more than 300 members of Parliament h

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