Democratic vice presidential nominee Tim Walz leaned on his time as a teacher and a football coach to sell the nation on his party's ticket.Mandel Ngan/AFP via Getty ImagesTim Walz frequently invoked his time as a football coach during his major convention speech.Walz served over a decade in Congress and is in his second term as governor of Minnesota.But it's his connection to the nation's most popular sport that might be one of his biggest assets.Democratic vice presidential nominee Tim Walz has a lengthy political résumé.