Labour might conceivably remain in power for a fourth term, thanks to NZ’s voting system. Bernard Moran reports.For New Zealanders, the race to win the ninth floor of the Beehive in Wellington on November 8 is providing drama and nail-biting uncertainty.As of October 13, most of the polls show Helen Clark’s Labour Party coming from behind to close the gap to 4 per cent on John Key’s Nationals.Yet, the latest Colmar-Brunton Poll has National ahead by 18 per cent, with 63 seats in parliament, to 4…