Having witnessed the original feud at first hand, both men are conscious of the need to avoid an irrevocable split.
Miliband's adviser Torsten Bell accidentally copied in Conservative MP James Morris, rather than the Labour pollster of the same name.
The key point about the email by a Miliband adviser describing Balls as "a nightmare" is that it was leaked in the first place.
The PM has hit families with a triple childcare whammy of falling places, rising nursery costs and cuts to support. Labour will show there is another way.
In a closely fought battle, when hospital wards face closure in marginal seats, there will be irresistible temptation for Labour to make promises that can’t be kept.
30 per cent of MPs support a ban on polling for a "defined period" before general elections, with backing for the proposal strongest among Labour.
The punitive penalty presents appalling dilemmas for vulnerable families. Ministers should finally accept that they have lost the argument.
The shadow education secretary must learn from Gove's mistakes and outline a curriculum that goes beyond memorisation and teaching to exams.
Promising an in/out vote would shift the debate back onto Tory territory and allow Cameron to claim that Miliband is dancing to his tune.
"Labour has too often renounced the transformative in favour of the transactional."