This is a leadersip race, not a federal election.

In a leadership race all 338 ridings are in play, they all have equal weight and Quebec has 78 of those ridings.  Quebec has about 30% of the votes for a leader.  That is why so much emphasis is being put on the ability to speak french.  In a federal election, it can be guaranteed that many ridings will go to different parties.  But in a leadership race every single riding counts.