FAIRVIEW, N.C. — Jamie Ager has spent much of the past year rebuilding his farm in the foothills of western North Carolina after Hurricane Helene tore through the region, cutting power, destroying fences and scattering livestock. Then, earlier this year, Ager lost his beef contract with local schools, a casualty of billions of dollars in cuts to the U.S. Department of Agriculture under the Trump administration. Now, the fifth-generation farmer is running for Congress — part of a new crop of Democratic candidates the party is turning to as it tries to compete in the tough, often rural districts it...