Strong performance will be Shearer's only tool in riding out Cunliffe challenge.
With an address to the Labour Party conference that earned a rapturous response at the weekend, David Shearer's leadership should have been settled. Unfortunately he has gone a step further, seeking the endorsement of his caucus today.
He will probably get it, but if he imagines the vote will see off a challenge from David Cunliffe he is already disappointed. Mr Cunliffe declared yesterday he would support the leader in an immediate vote but reserved his position in February when party rules will force the issue again.
The prospect of a vote this week has served only to sharpen Mr Cunliffe's public comments. Mr Shearer now needs to respond to overt disloyalty, possibly by banishing his rival from the front bench, which would do the challenger no harm at all. An "exile" is always in a better position to criticise the leadership and become a focus of discontent.
A more experienced leader would have dismissed any suggestion he should try to "call out" a challenge with an early vote. When a leader wins - as usually happens the first time - the question does not go away. It merely leaves the party divided and ensures the discontented faction will choose its moment to make another bid.