Paul Ryan, the chairman of the House Budget Committee, sounds upset. And you can see why: President Obama, to the great relief of progressives, has called his bluff.

Last week, Mr. Ryan unveiled his budget proposal, and the initial reaction of much of the punditocracy was best summed up (sarcastically) by the blogger John Cole: “The plan is bold! It is serious! It took courage! It re-frames the debate! The ball is in Obama’s court! Very wonky! It is a game-changer! Did I mention it is serious?”

Then people who actually understand budget numbers went to work, and it became clear that the proposal wasn’t serious at all. In fact, it was a sick joke. The only real things in it were savage cuts in aid to the needy and the uninsured, huge tax cuts for corporations and the rich, and Medicare privatization. All the alleged cost savings were pure fantasy.

On Wednesday, as I said, the president called Mr. Ryan’s bluff: after offering a spirited (and reassuring) defense of social insurance, he declared, “There’s nothing serious about a plan that claims to reduce the deficit by spending a trillion dollars on tax cuts for millionaires and billionaires. And I don’t think there’s anything courageous about asking for sacrifice from those who can least afford it and don’t have any clout on Capitol Hill.” Actually, the Ryan plan calls for $2.9 trillion in tax cuts, but who’s counting?