I would never begrudge a politician the right to take a change of direction in their own life and that of their families if they wish to.
It seems to me he was one of the big characters in Labour who understood that an opposition can't just shout at a Government. An opposition also needs to come up with its own alternative.
So, to that extent I think it is a real loss to the Labour Party that he is no longer around making that point within Labour Party circles.
David Miliband was nearly Prime Minister, and nearly Labour party leader, but his brother's rise has led him to take a back seat.
David Miliband will resign as an MP to take up a job in America, a move which is set to be announced today.