Rep. Maxine Waters, D-CA, this week unveiled a mortgage-finance reform bill that would replace Fannie Mae and Freddie Mac with a private cooperatively-owned entity that would issue a new form of conventional MBS backed by a mix of public and government credit support. The “Housing Opportunities Move the Economy Forward Act” adds a few new twists to the notion of creating an explicit government MBS guaranty that would stand behind a first-loss position funded by the private sector. Rather than allow a variety of private-sector firms to issue these securities, as the bipartisan Senate bill would, Waters’ proposal would create a single, cooperatively-owned entity that would be open to all lenders. The regulator of this new market, the National Mortgage Finance Administration, would have...