wellington new zealand newly invigorate labour party widen lead govern national party threaten decade-long hold power poll show thursday two party leaders exchange jab third debate week national fell point 39 percent support opposition labour party unchanged 43 percent poll release website news broadcaster show new zealand hold general election sept. 23. poll still tip nationalist new zealand first likely kingmaker show green party would make parliament jacinda ardern almost single-handedly change chance labour party since take leader last month charisma popularity offset criticism vague tax plan tight immigration policy national leader bill english pin bid government strong economic record say particularly worry poll result number would seem labour/new zealand first government would likely outcome depend number negotiations say grant duncan associate professor massey university auckland base number new zealand first would key player labour national new zealand dollar fell day low 0.7173 stand 0.7207 shortly poll result release poll show support new zealand first party rise point percent support green party remain percent duncan say green perilously close percent vote threshold get seat parliament ardern reiterate first call would green party work agreement position form coalition government vote debate saw party leaders trade jab tax house much two previous encounter also touch allegations week national nz 11.7 billion hole labour fiscal plan claim reject labour one refute economists accord media continue maintain maintain lie mislead voters wrong ardern tell english debate support labour overtake national similar poll release week ago new zealand 's labour widen lead govern party lose grind