New Labour leader David Cunliffe received less than a third of the support of caucus when the votes were counted yesterday.
But the support between himself and main rival Grant Robertson was more even if second preferences were counted.
The results show that Mr Cunliffe won the support of just 11 of the 34 MPs, Mr Robertson 16 MPs and Shane Jones 7 MPs.
If Mr Jones' supporters' second preference votes had been used, Mr Cunliffe would have picked up five more caucus votes to make a total of 16, and Mr Robertson would have picked up two, to make a total of 18.
All those voting had to rank the three candidates in their preferred order.