As a leader in any organisation the pressure is relentless. Pressure to lead by example, to maintain stability whilst innovating, to meet targets whilst maintaining morale, to direct and to listen, I could go on and on.
A critical part of leadership is choosing the right team to surround you and work with. One weak link can bring the whole team down.
This is part of Jeremy Corbyn's leadership problem. Whilst he has tried to position himself as a kinder, gentler politician to the leaders that have gone before him. He has surrounded himself with some of the nastiest people in the Labour Party - the most prominent example being Ken Livingstone.
As a leader you are judged by your own actions, but also by the actions of your team. So choose carefully. Give clear expectations and boundaries. Act quickly when someone steps out of line.
Leadership is a team sport!
But he does matter, because Jeremy Corbyn has made him matter. Mr Corbyn has given him a role in the Labour policy machine, (he jointly runs a review of defence and foreign policy, presumably including Labour’s view of the Middle East) and thus, a platform. Yes, there are noises off from the Corbyn camp that even they are exasperated with Mr Livingstone’s awful behaviour, but that’s just noise. If Mr Corbyn wants to make clear that Mr Livingstone and his bile have no place in the decent and compassionate Labour Party he claims to lead, he could do so in an instant.