Debt to reach 3/4 of the entire national economy?

The White House itself is predicting a rise in the national debt that is beyond comprehension:

Figures released by the White House budget office foresee a cumulative $9 trillion deficit from 2010-2019, $2 trillion more than the administration estimated in May. Moreover, the figures show the public debt doubling by 2019 and reaching three-quarters the size of the entire national economy.

The Wall Street Journal reports slightly smaller percentages but includes the fact that by the end of next year, the deficit will be close to two-thirds of the Gross Domestic Product: “The U.S. public debt will exceed 61% of gross domestic product by the end of 2010, the CBO said, with that figure rising to 68% of GDP by the end of 2019.”

The Gross Domestic Product this year is just over $14 trillion.