Jeneroux's resignation history and speculation

Prime Minister Mark Carney and the Liberals welcomed a third Conservative floor crosser on Wednesday – Edmonton MP Matt Jeneroux. 

And with three by-elections coming up, two from Liberal strongholds, a Liberal majority is looking like a possibility. So a pretty seismic day on Parliament Hill. 

CBC’s senior writer Aaron Wherry is here to talk through how this could all play out for the Liberals and for Pierre Poilievre’s Conservative Party. 

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