Chait, along with several other pundits, thought that this very funny ad was legit. And it takes a very canny soul to pwn Chait. He updates:

This ad is a parody.  I should have trusted my stereotypical beliefs about Canadians.

Other versions of the same ad are "paid for by the friends of people against the kicking in the face of children" and "by concerned pediatric orthodontists." 

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