Wisconsin Lt. Gov. and Democratic challenger for U.S. Senate Mandela Barnes has officially conceded the race to incumbent Sen. Ron Johnson after results showed a slim margin between the two.
WATCH: Mandela Barnes concedes U S Senate race to Sen Ron Johnson news8000.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from news8000.com Daily Mail and Mail on Sunday newspapers.