Leading Republicans and Democrats on the Senate Banking, Housing and Urban Affairs Committee this week launched an ambitious effort to draft a bipartisan housing-finance reform bill, and possibly approve it by year end. Several lawmakers from both sides of the aisle cited a growing consensus about how that reform should be undertaken, with most agreeing on the preservation of the to-be-announced market and the need for an explicit government guarantee for MBS backed by conventional mortgages. Committee Chairman Mike Crapo, R-ID, listed...