People compare the political cultures of the USA and Canada but I think that is quite futile considering the nature of the two countries.
It is more interesting to compare the political cultures of Canada and Australia as they are, despite the distance, very similar countries when the structure of the country is considered.
One major difference between these otherwise similar countries is that there doesn't seem to be in Canada at all a phenomenon which happens very often in Australia.
Namely, that the incumbent PM does not only have to worry about the next election and the opposition-party but in Australia the PM has been ousted many times as leader of the governing party and hence as PM. In the previous Labor-administration two party-leaders and PMs, Rudd and Gillard, both ousted each other.
The current PM also became PM by ousting the previous PM in the middle of an electoral-term.