Now, this is awkward. One agency of the federal government is suing a company for fraud while another agency continues to endorse it. On Monday in Los Angeles, the Department of Justice sued Standard & Poor's and its parent McGraw-Hill MHP -0.25% for $5 billion. The claim is that S&P committed civil fraud when it issued high credit ratings on mortgage-related securities prior to the financial crisis of 2008. Sixteen states and the District of Columbia have piled on the suit. No doubt investors who relied on the opinions of S&P and the other big credit-rating agencies, Moody's and Fitch,...