Democrat Cal Cunningham, who had been considered the leader for a U.S. Senate seat in North Carolina until his campaign was undermined by a sex scandal, conceded the closely fought contest to Republican incumbent Thom Tillis. Subscribe: http://smarturl.it/reuterssubscribe Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled. Get the latest news on: http://reuters.com/ Follow Reuters on Facebook: https://www.facebook.com/Reuters Follow Reuters on Twitter: https://twitter.com/Reuters Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en