The U.S. Postal Service can’t fix its finances through cuts alone, Postmaster General David Steiner said Friday. Steiner said the 150-year-old agency needs to expand its revenue base to restore prominence in the nation’s delivery network. It also should capitalize on its long-standing legal obligation to deliver to every address. One way it can do that, Steiner said during the Postal Board of Governors meeting in Washington, is by working with more customers to provide final or “last mile”