Could the alienated grumpies have a greater effect on New Zealand political life?
This was written before John Key announced his resignation. Other than perhaps the tense I think there is no need for revision.
Unfortunately most analysis on the American elections focuses on who voted but, as Bob Chapman pointed out, the Non-Vote Party plays an important role. This is yet another example of Gilling’s law of how you score shaping the game; in this case pollsters tend to score voters and pay little attention to those who do not vote.