WATCH: Joe Biden: I couldn't have won White House race

US vice president Joe Biden has admitted that he decided against running for the White House because he “couldn’t win” – not because he would have had too little time to get a campaign up and running.

“I’ll be very blunt. If I thought we could have put together the campaign that our supporters deserve and our contributors deserved I would have done it,” he said on CBS’s 60 Minutes TV programme.