SIOUX FALLS, S.D. (KELO) -- Former U.S. Senator Tim Johnson never lost an election and was the longest-serving public official in South Dakota history.  University of South Dakota share Tim Johnson’s impact During his time in Washington, Johnson impacted everything from health care to farming and from military funding to water projects. His work continues to touch all corners of South Dakota.  In the player above you can see the KELOLAND News Special Report on Tim Johnson ahead of Friday’s funeral.