OPINION - Joe Biden's calamitous debate: will he be replaced on the ticket?

Many years ago, I missed out on a job because I lost my temper. It was one of those awful 48-hour interviews with workshops, team tasks and worst of all, a three-course dinner bang in the middle. I didn't scream or get abusive, but I did let my frustration get the better of me about something or other. Given my strong scores in earlier rounds, all I needed to do was smile, exude an air of calm and the gig was mine. I couldn't do it.