By Craig McCulloch of RNZ National's partners Act and New Zealand First have taken a tumble in support in the latest Taxpayers' Union-Curia poll, but the coalition bloc is still holding its lead. Under the results, released on Tuesday, the government bloc would receive 62 seats, down three since April, compared with the opposition bloc on 58, up three. Labour remained the most popular party on 31.9 percent, but took a sizeable knock since the last survey, dropping 1.5 points. National edged up 0.2 points to hit 30 percent. NZ First was down 1.9 points to 11.7 percent. The Green Party was in fourth spot on 9.7 percent, up 1.9 points, while Act took the biggest hit, down 2.5 points to 6.5 percent. Te Pāti Māori came in at 4.1 percent, up 1.5 points. On those numbers, National would bring 39 MPs into Parliament. They would be joined by 15 MPs from NZ First and eight from Act, to make a 62-strong coalition.…