By Patrick J. Buchanan, CNSNews - With the national debt already equal to the GDP, and growing faster now, a question arises: Where does this end?.. How many more multi-trillion-dollar deficits can we sustain before the quality of U.S. debt is called into question by Japan, China and the other nations that traditionally buy and hold U.S. debt?... How long before the value of the U.S. dollar is questioned?