Their strategy is brilliant. They are not piling on all at once by downgrading the United States in concert. Standard & Poor's is the bad cop for now, taking the first swipe at the United States last Friday, and seeing its influence confirmed by the stock market's dramatic reaction. Moody's and Fitch are playing the good cop - exercising restraint about a potential downgrade, yet still flexing their muscles by criticizing the government both publicly and behind the scenes.  

The rating agencies have the federal government over a barrel. If politicians ignore rating agencies' warnings, they risk a withering assault of additional downgrades that could undercut confidence in the government and inflict soaring interest rates. The good-cop, bad-cop routine is especially potent because a downgrade by two of the three major rating agencies could lead to negative consequences, such as requiring some bond issuers to secure additional collateral.