With longer-term U.S. interest rates rising and no plan to reduce the budget deficit, is a U.S. national debt crisis imminent?

Topics covered include:

Why S&P, Fitch, and now Moody's stripped the U.S. of its pristine AAA debt rating
How the U.S. national debt dynamics compare to Greece, Italy, and Japan
What are four things investors should monitor for signs that the national debt crisis is worsening or spiraling out of control