1. Speak softly, but carry a big stick
It is a truism that New Zealand voters hanker for tough leaders - until they eventually tire of them. The new Labour leader is going to have to be one tough cookie. His or her first priority is to end the latent civil war between the parliamentary wing and factions on the left of the wider party.
This will require banging heads together. Labour cannot "reconnect" with voters until the party convinces them it is once more a truly unified political force. Unity is paramount. Unity is the pre-condition for everything else to happen.
None of the contenders for the leadership has enough mana, charisma, charm or chutzpah to make Labour electable without first dealing with the rot within. They are all quietly spoken.