The chairman of the Senate Committee on Banking, Housing, and Urban Affairs signaled this week that Congress is unlikely to take up comprehensive legislation to reform the government-sponsored enterprises before the presidential election this fall. Committee Chairman Richard Shelby, R-AL, asked the Government Accountability Office to publish a report on a variety of issues involving the GSEs and their potential future structure by Nov. 1. Shelby’s deadline could be ambitious for such a complex issue: a report published last week by the GAO on issues with nonbank mortgage servicers was requested back in October 2014. The timeline suggests...