Not only that, but the saying itself is rather old. For example, it shows up in this aticle from 1829.
Hell, I've even seen FReepers use the term.
What's reallyamusing, is how quickly folks have gotten hysterical about the old saying. Tells me a lot more about them, than it does about Obama.
Well, yes, it was used, but as the article you cited pointed out, it was almost as controversial then as it is now, coming in the shadow of the recent civil war. What strikes me is the expression “vindictive passions,” and the corollary fear that Jackson would be the president of a party not a country. That is what resonates with the current flap, and while FReepers may reasonably be expected to use a term like “enemy” with near reckless abandon, I think we have a right to expect our President to represent, whether in word or deed, the country as a whole, and not just a party. That thought alone, were he to practice internalizing it daily in front of his mirror, would greatly reduce his exposure to ridicule.