From Elizabeth Ecker's article in Reverse Mortgage Daily:

Several states joined a lawsuit last week that challenges the constitutionality of the Dodd-Frank Wall Street Reform and Consumer Protection Act. Oklahoma, South Carolina and Michigan are suing over a specific authority having to do with pension contributions they say puts those contributions at risk. 

The states join the State National Bank of Big Spring, Texas; the 60 Plus Association; and the Competitive Enterprise Institute in the suit, originally filed in June.