Put it this way: When Republicans took control of the House, they declared that their economic philosophy was “cut and grow” — cut government, and the economy will prosper. And thanks to their scorched-earth tactics, we’ve actually had the cuts they wanted. But the promised growth has failed to materialize — and they want to make that failure Mr. Obama’s fault.

Now, all of this puts the White House in a difficult bind. Making a big deal of Republican obstructionism could all too easily come across as whining. Yet this obstructionism is real, and arguably is the biggest single reason for our ongoing economic weakness.

And what happens if the strategy of obstruct-and-exploit succeeds? Is this the shape of politics to come? If so, America will have gone a long way toward becoming an ungovernable banana republic.