HURON, Calif.— This Central Valley outpost is one of the most fertile places on Earth, attracting thousands of seasonal laborers to harvest lettuce and reaping windfalls for big agribusiness.... But for most of Rey León’s life, the city of Huron has been a transportation desert.... Even after he was elected Huron mayor five years ago, León’s lobbying for reliable bus routes to Fresno, Visalia and Coalinga got nowhere with regional planners, who chafed at the cost.“ It’s always about who do you