For over a year now Angus Reid have been offering a broad section of the population the opportunity to sign up and participate in their online polls. So I don't understand why you see this as a  problem. The participants self-identified as belonging to or preferring a  variety of political parties.  Results appear plausible  given a very high % of Conservatives were against the settlement and a lessor % of Liberals and NDP were against it.  It is no less random than a phone poll conducted during the daytime when a large percentage and critical demographic of the population are at work.