[Rendello]

Carney's support is strong in Canada:

Mar - Wins Liberal leadership and thus prime ministership. Calls election.

Apr - Liberals easily win election, Carney keeps prime ministership.

Nov - PM's budget passes. A Conservative crosses floor to Liberals.

Dec - Second Conservative crosses floor to Liberals.

The budget being being rejected would've meant another election; the opposition would've rejected it if they were confident they'd win. The two defections means that the liberals are now one member away from a majority. In fact, there was rumoured to be a third defector from the opposition, but he decided to quit politics entirely, presumably after being whipped by the whip.