Mr. Obama did not deign to propose an alternative to rival Mr. Ryan's plan, even as he categorically rejected all its reform ideas, repeatedly vilifying them as essentially un-American. "Their vision is less about reducing the deficit than it is about changing the basic social compact in America," he said, supposedly pitting "children with autism or Down's syndrome" against "every millionaire and billionaire in our society." The President was not attempting to join the debate Mr. Ryan has started, but to close it off just as it begins and banish House GOP ideas to political Siberia.

Mr. Obama then packaged his poison in the rhetoric of bipartisanship-which "starts," he said, "by being honest about what's causing our deficit." The speech he chose to deliver was dishonest even by modern political standards.

The great political challenge of the moment is how to update the 20th-century entitlement state so that it is affordable. With incremental change, Mr. Ryan is trying maintain a social safety net and the economic growth necessary to finance it. Mr. Obama presented what some might call the false choice of merely preserving the government we have with no realistic plan for doing so, aside from proposing $4 trillion in phantom deficit reduction over a gimmicky 12-year budget window that makes that reduction seem larger than it would be over the normal 10-year window.