But the most interesting part of his answer was the beginning, in which he tried to walk back, or at least clarify, his statement from yesterday. He spoke slowly, with long pauses, giving the sense that he was speaking with great thought and precision: “Well, first of all, let me be very specific. Um [pause], we have not seen a court overturn [pause] a [pause] law that was passed [pause] by Congress on [pause] a [pause] economic issue, like health care, that I think most people would clearly consider commerce. A law like that has not been overturned [pause] at least since Lochner, right? So we’re going back to the ’30s, pre-New Deal.”

In fact, Lochner–about which more in a moment–was decided in 1905. Thirty years later, after the New Deal had begun, the high court unanimously struck down one of its main components, the National Industrial Recovery Act, as exceeding Congress’s authority under the Interstate Commerce Clause. The case was A.L.A. Schechter Poultry Corp. v. U.S. (1935).

It is true that in subsequent New Deal cases, the court vastly expanded Congress’s power to regulate “interstate commerce,” although it has never done what the administration asks it to do now, namely authorize Congress to force individuals to engage in commerce. Obama seems to have been trying to make the accurate observation that since the ’30s the court has not struck down a federal law that applies to economic activity on the ground that it exceeds Congress’s Commerce Clause authority.

But in citing Lochner, the president showed himself to be in over his head.