The proposed “Public Guarantor” to replace the government-sponsored enterprises would not only provide an explicit backstop for qualifying MBS in a post-GSE world, it would also serve as a regulator of sorts under terms spelled out in a housing policy paper issued this week. The report by the Bipartisan Policy Center’s Housing Commission called for a “far greater role” for the private sector in the mortgage market, a continued but limited role for the federal government, the graduated elimination of Fannie Mae and Freddie Mac and reform of the FHA. The BPC’s plan calls for...