(Washington, DC)  --  U-S Senator Tina Smith says she wants answers from the U-S Postal Service about its recent changes to first-class mail services that lead to  longer delivery times and increased costs.   The Minnesota Democrat says people depend on the postal service to fill their prescriptions, to pay their bills, to vote, to pay their taxes, and this is especially a big deal in rural communities, tribal communities or for people who are isolated at home.  Smith says that she understands the post office's "desire to overcome budget shortfalls" but adds that the new standards will result in the slowest mail delivery that we've seen in 50 years.