While we're on the subject of Stephen Harper's campaign to insult Canada, let's note the significance of his choice of attacks on Tom Mulcair.
As others have pointed out, the "career politician" complaint makes absolutely no sense as an attempt to contrast Mulcair against Harper - who has been in politics longer, and has far less of an outside resume, than his NDP counterpart.
But it might be explained if the Cons see a need to contrast Mulcair against Justin Trudeau - particularly to revive the latter's campaign enough to create the vote splits which the Cons need to have any hope of survival when two-thirds of Canadian voters want them gone.
In other words, the Cons look to be banking on being able to control not only the message they're sending to possible supporters, but also the behaviour of voters who have long since ruled them out. And it's doubtful that even a doubled expense limit will leave enough room to make that happen - particularly given the credibility issues arising when the Cons' messages are now as contradictory as they are