With the former SDP leader, Tony Blair and Len McCluskey all backing his reforms, Miliband has built an impressively large coalition of support.
After today's comfortable victory, far greater political and financial challenges lie ahead for the party.
The Labour leader's message: the reforms will get working people back into politics, transfer power from MPs to party members, and help turn Labour into a movement again.
Having failed to predict the hung parliament of 2010, commentators may now be making the reverse error by underestimating the chance of an overall Labour victory.
Miliband doesn't want to make a pledge that raises more questions than it answers.
A report on the policy by the Department of Energy and Climate Change is released following a freedom of information request by the New Statesman.
The Labour leader says "there’s a big, big contrast between us as an expanding party and the Tories".
The Tories could use a debate between the Lib Dem leader and his UKIP opposite to argue for the head-to-head contest they want between the two main leaders.
The contrast between Blair's bid to save Brooks and Miliband's call for her resignation is a reminder of how Labour has changed for the better since 2010.
There is no guarantee that fair distribution of opportunity will even be a factor in the election.