Oh come off it, the Tories are the biggest US sycophants of them all. Harper has even said if we don't get a rollback on the Buy America policy he still won't make any retalitory moves.
I'm not much of a Harper-phile myself, but I do agree with him on the point that there really isn't much Canada could do against the US without hurting ourselves at the same time (and besides, the US is hurting itself just as much as it is hurting us with these measures anyway). Any retaliation would be an economic kamikaze attack. The best retaliation we could hope for would be to raise the price of Canadian resources going to the US. That would be the best we could do, the retaliation that woudl hurt Canada the least and the US the most. But even that would still hurt Canada and so would still be a 'drown him even if I drown with him' kind of policy.