That lines up with my thoughts as well, in terms of hypocrisy, yes, it would be interference.    In reality, if what is told is the extent, if he was sending campaign fund or engaged in overt actions beyond a statement of support, I would probably shift position.    The thing is, the endorsement changes nothing.  People that like Trudeau tend to like Obama, people that dislike Trudeau would view the endorsement as confirmation.  The polls may say different, but my perspective is that Trudeau is unlikely to win.