Three House Democrats plan to introduce a new housing-finance reform bill that would leverage the Ginnie Mae mortgage-securitization infrastructure and private mortgage insurers. The reform proposal by Reps. John Delaney (MD), John Carney (AL) and Jim Himes (CT) would establish a system of government reinsurance for eligible mortgage-backed securities. The idea is to leverage the government’s capacity and market’s ability to price risk, they said. Their plan calls...