Interactive version of the chart here.
If you’re Labour you really want to be able to go into coalition with New Zealand First and the Greens, and be able to pass legislation with either party. Current results would see them trying to pass budgets with the support of Greens, New Zealand First and Hone Harawira, which doesn’t seem very sustainable.
(Thanks to Peter Green for getting the tracking poll script working again. Some day I will learn R so I can fix these things myself.)