I have to admit general ignorance on this, but if Harper couldn't run in the next election for some reason, who's the front-runner to be his successor within the party? Is this something we know?
I agree with BigJonsson, almost certainly Jason Kenney. Flaherty and Baird would have been strong contenders but Kenney has seems to have strong party support and has been a Harper favourite since they've come into power and especially since his stint as Minister of Immigration.
I wonder how long Harper plans to stay on for since next year will be 10 years for him (assuming he wins the election). He should write a book on Machiavelli and the Harper years if he decides to retire. I'd read it, the inner working of this government are extremely fascinating considering how much maneuvering there is and how closed off it is