A Senate bill filed last week by a Georgia Republican would wind down Fannie Mae and Freddie Mac and create a transitional mortgage program that would be sold to the private sector within a decade of the proposed legislation’s enactment. The Mortgage Finance Act of 2013, S. 1048, by Sen. Johnny Isakson, R-GA, reprises his proposed legislation of the same name from 2011. The bill would replace the two government-sponsored enterprises with a single Mortgage Finance Agency. The MFA created under S. 1048 would be...