Thank you for all your comments. Thank you also for correcting me - the candidate need not live in the riding he is running in. But he still must be an eligible elector. And his status as an eligible elector, in my opinion, is in doubt.
One commenter is certainly right - the public does have a right to Ignatieff's permanent address. The problem with Ignatieff is not that he is possesses the possibility of being an elector because he certainly does. The problem of Ignatieff is that he may have voided this possibility by indicating his return to Harvard if his candidacy does not work out. This intention, interestingly, does matter. As I reiterated before, intention is used to determine where students are eligible to vote. Where they intend to return after their studies is their eligible district. What is Ignatieff's?
It is still important to keep in mind that the final call does come down to the wisdom of the Returning Officer though. I am in no way saying that Ignatieff should or shouldn't have the right to vote or be a candidate. I am merely questioning his candidacy based on current election law. I don't know of any cases where a Canadian has been denied their right to vote. Can anyone think of such a case? I dont suspect there are many. It's that Charter thing.