The credit rating agencies are taking advantage of the country’s financial problems to increase their own political power. They want to ensure that regulators do not reduce their autonomy and influence. 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.