Review & Outlook: The Road to a Downgrade - WSJ.com
A downgrade isn't catastrophic because global financial markets decide the creditworthiness of U.S. securities, not Moody's and Standard & Poor's. The good news is that investors still regard Treasury bonds, which carry the full faith and credit of the U.S. government, as a near zero-risk investment. But a downgrade will raise the cost of credit, especially for states and institutions whose debt is pegged to Treasurys. Above all a downgrade is a symbol of fiscal mismanagement and an omen of worse to come if we continue the same habits.
President Obama will deserve much of the blame for the spending blowout of his first two years (see the nearby chart). But the origins of this downgrade go back decades, and so this is a good time to review the policies that brought us to this sad chapter and $14.3 trillion of debt.