As soon as the Obama administration-in-waiting announced its stimulus plan — this was before Inauguration Day — some of us worried that the plan would prove inadequate. And we also worried that it might be hard, as a political matter, to come back for another round.

Paul Krugman

Unfortunately, those worries have proved justified. The bad employment report for June made it clear that the stimulus was, indeed, too small. But it also damaged the credibility of the administration’s economic stewardship. There’s now a real risk that President Obama will find himself caught in a political-economic trap.

I’ll talk about that trap, and how he can escape it, in a moment. First, however, let me step back and ask how concerned citizens should...