Sir Keir came under attack from the left and the right of Labour today for his safety first approach to the leadership.
Sir Keir faced accusations of being too 'timid' from Blair-era minister Peter Mandelson and Sharon Graham, the leader of the Unite union.
Ms Graham told Sky News today that while she wanted Labour to win the next election there was 'a difference between limping into Number 10 and being carried in', and demanded a 'better offer' for workers.
In an interview on the first day of the Labour Party Conference in Liverpool, Lord Mandelson agreed with the Hard Left union leader.