Diane Abbott has agreed to this request to issue a manifesto spelling out how she would act if elected as Leader of the Labour Party. Andy Burnham was the first to agree to do this.
Responses are still awaited from the other three candidates. They were first contacted on the matter over a month ago. Subsequently David and then Ed Miliband had the matter brought to their attention at public meetings. Whilst Ed Balls has been contacted on the issue by one of his parliamentary nominees.
So we could yet get 5 out of 5. If you have a vote in the Labour Leadership contest, then you can sign up to this campaign here.