Voters react to Labour/Green power policy?

The latest Roy Morgan poll shows surge of support for National and notes that

National Party rebounds 6% to 46.5%; Labour down 4% to 31.5% As New Zealand passes laws to legalise same-sex marriage

Strangely it fails to mention the Labour/Green power policy also announced during this period (April 15-28) which is likely to have far more effect on voter choice.