Ugh. And yes, the wording of the title is deliberate; look at the story Mankiw links to and you will see that the protectionist measures being proposed by (surprise!) Canadian labor unions are modeled explicitly on the “Buy American” provisions in the stimulus bill. Heck, the labor unions in Canada even say that they have no problem with the Buy American provisions–I suppose that sentiment holds just so long as no one has any problems with Buy Canadian provisions either.
It’s no exaggeration to say that the President of the United States has done his part to give people in other countries an excuse to practice protectionism against the United States. Heck of a job, as they say these days.