Video: Our reporter on the biggest speech of Tim Walz’s career

Gov. Tim Walz completed his transformation from little-known governor to leading party figure with his keynote address at the Democratic National Convention in Chicago on Wednesday night. While he delivered the most consequential speech of his career, the crowd made it clear that they had quickly become familiar with his life story, including his background as a former high school football coach. “We’re down a field goal,” he said. “But we’re on offense and we have the ball.”