President Obama’s plan to stimulate the economy was “massive,” “giant,” “enormous.” So the American people were told, especially by TV news, during the run-up to the stimulus vote. Watching the news, you might have thought that the only question was whether the plan was too big, too ambitious.

Yet many economists, myself included, actually argued that the plan was too small and too cautious. The latest data confirm those worries  and suggest that the Obama administration’s economic policies are already falling behind the curve.

To see how bad the numbers are, consider this: The administration’s budget proposals, released less than two weeks ago, assumed an average unemployment rate of 8.1 percent for the whole of this year. In reality, unemployment hit that level in February  and it’s rising fast.

Employment has already fallen more in this recession than in the 1981-82 slump, considered the worst since the Great Depression. As a result, Mr. Obama’s promise that his plan will create or save 3.5 million jobs by the end of 2010 looks underwhelming, to say the least. It’s a credible promise  his economists used solidly mainstream estimates of the impacts of tax and spending policies. But 3.5 million jobs almost two years from now isn’t enough in the face of an economy that has already lost 4.4 million jobs, and is losing 600,000 more each month.