Former Nashville Mayor Megan Barry on Wednesday announced a Democratic run for the U.S. House seat held by Republican Rep. Mark Green, seeking a political comeback more than five years after the fallout from an extramarital affair cut her tenure short. In an announcement video, Barry cited several reasons for trying to return to elected office — a spate of mass shootings at schools, including earlier this year at a Nashville Christian elementary school; Tennessee's abortion ban; the closure of rural hospitals; and the opioid epidemic. Barry is running in one of three congressiona...