Labour leader appoints negotiating team and urges the PM to stop "dragging his feet" and sign up to three debates.
Cameron won't repeat Romney's gaffes and enjoys the advantage of incumbency.
Were the debate to be held before the general election campaign begins, the impartiality rules would not apply.
The party previously suggested that workers would be offered a fixed-hours contract after 12 weeks. But that period has been extended to a year.
The man who masterminded Obama's two election victories embodies daring politics.
Former senior Obama adviser joins the party's general election team.
The right want Ed Miliband to be more "pro-business". The left want him to abandon austerity. His challenge is to hold the centre.
To resign ourselves to a return to the economic pathologies of the past, as the Tories do, would be to miss a historic opportunity.
Rather than just needling the PM, the Labour leader should have the made case for reform.