This won't fly: Additional tax cuts & public works spending translate to 11% of GDP. Economists consider annual deficits above 3% to be unsustainable.

From The New York Times:

The additional tax cuts and public works spending that President Obama has proposed to spur job creation would add $100 billion to this year’s deficit, bringing it to nearly $1.6 trillion, according to an administration official.

A deficit of that size for the fiscal year that ends Sept. 30 would be about $150 billion greater than last year’s deficit, which was the highest since World War II.

Measured against the size of the economy, a $1.6 trillion shortfall would equal almost 11 percent of the gross domestic product. Economists generally consider annual deficits above 3 percent to be unsustainable.

Last week, the nonpartisan Congressional Budget Office projected that this year’s deficit would be more than $1.3 trillion without further spending or tax cuts. Mr. Obama’s proposed $100 billion stimulus package, which includes tax credits for small businesses that make new hires and money for infrastructure projects, is less than a $154 billion package that the House approved in December but more than a measure the Senate is drafting.