Business minister, who recently returned from maternity leave, would replace Ed Davey.
Despite the media assault on Miliband and the strengthening economic recovery, the party is seven points ahead.
The PM's blast at Miliband over tomorrow's strike secured him victory.
Ministers' claims contradicted as civil service head says "we shouldn't beat about the bush: it hasn't been signed off".
The claim that Labour has moved too far to the left is based on a misreading of public opinion.
Miliband has asked radical questions but the answers have been too cautious for some.
"The Tories just don't understand that there is a difference between public services and businesses."
Large companies are increasingly troubled by the threat of EU withdrawal under the Tories.
The Labour leader's vision of "responsible capitalism" would gain credibility if he could find more responsible capitalists.
While the the Tories are increasingly reliant on a small pool of mega rich donors, Labour is rebuilding itself as a movement.
In Labour's "economy week", its leader avoided the subject.
Miliband's party will not be left as the only one that "doesn't trust the people".
"The socialism of the future will be about creating power together for individual freedom."
The Labour leader routed the PM in the Commons as he derided "a masterclass in how to alienate your allies".
The proposed plan could increase pressure for tax cuts and undermine the contributory principle.
Shadow chancellor commits Labour to retaining "the most competitive corporation tax rate in the G7".
The Labour leader will now need to go even further to meet demands for a "radical offer".
The 12 policies the party needs for a popular and a radical manifesto.
We need a European energy union capable of negotiating collectively over price and acting as a strategic sponsor.
Britain looks closer to the EU exit than ever - an outcome the PM never wanted.
The shadow London minister has several key advantages over his rivals.
Burnham’s plan shows the party grappling with the kind of real world problems it would face in office.
The party needs the Tories to move ahead of Labour to encourage Scots to back independence.
The party rejects women's minister Nicky Morgan's suggestion that "no option is off the table".
With the young most in favour of EU membership, euroscepticism faces death by demographics.
After the Chancellor boasted that inequality had fallen, welfare cuts mean it is rising again.
Labour's policy review head on Ed Miliband’s difficulties, his vision for the party and why he’s more interested in sport than politics.
"It’s not about Andy, or Ed, or Yvette," Labour's policy review head tells the New Statesman.
The media inquiry and Miliband's pose with the Sun gifted victory to the PM.