The Postman
Gordon Krantz survived the Doomwar  only to spend years crossing a post-apocalypse United States looking for something or someone he could believe in again. Ironically, when he's inadvertently forced to assume the made-up role of a "Restored United States" postal inspector, he becomes the very thing he's been seeking: a symbol of hope and rebirth for a desperate nation. Gordon goes through the motions of establishing a new postal route in the Pacific Northwest, uniting secluded towns and enclaves that are starved for communication with the rest of the world.  And even though inside he feels like a fraud, eventually he will have to stand up for the new society he's helping to build or see it destroyed by fanatic survivalists. This classic reprint is not one of David Brin's best books, but the moving story he presents overcomes mediocre writing and contrived plots.