Now, obviously, six or seven Canadians watching Paul Krugman is not a scientific survey. There are 33.2 million Canadians , so seven people would not make a legitimate sample, would it? [That would be a sample size of .000002%] On the other hand, if you called up 527 self-identified Republicans nationwide , and only 221 of them said they were sure that Barack Obama was born in the United States, would that entitle you to say that 58% of all GOPers are potential birthers? Well, let's see: there are roughly 55 million Republicans in the US , so that would be a sample size of .000095%, which is an order of magnitude larger but hardly conclusive. Anyway, the Krugman video is funny in inconsequential, and only 34 seconds long.