MORE than four million Americans have lost their homes since the housing bubble began bursting six years ago. An additional 3.5 million homeowners are in the foreclosure process or are so delinquent on payments that they will be soon. With 13.5 million homeowners underwater — they owe more than their home is now worth — the odds are high that many millions more will lose their homes.

Housing remains the biggest impediment to economic recovery, yet Washington seems paralyzed. While the Obama administration’s housing policies have fallen short, Mitt Romney hasn’t offered any meaningful new proposals to aid distressed or underwater homeowners.

Late last month, the top regulator overseeing Fannie Mae and Freddie Mac blocked a plan backed by the Obama administration to let the companies forgive some of the mortgage debt owed by stressed homeowners. While half a million homeowners could be helped with a principal writedown, the regulator, Edward J. DeMarco, argued (we believe incorrectly) that helping some homeowners might cause others who are paying on their loans to stop so that they also could get their mortgages reduced.

With principal writedown no longer an option, the government needs to find a new way to facilitate mass mortgage refinancings. With rates at record lows, refinancing would allow homeowners to significantly reduce their monthly payments, freeing up money to spend on other things. A mass refinancing program would work like a potent tax cut.