What are we to make of John Key's bombshell? Reactions will obviously vary according to the political views of those making them, but his statement should be taken - initially at least - at face value. We should all understand the pressures that public life imposes, particularly on
Opinion: Key's legacy is mixed
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John Key's resignation has left many shocked. Photo/Getty
His "nice guy" image certainly struck a chord with many voters, even if others deplored his glibness and, on occasion, apparent slipperiness. He was faced with serious challenges - the Global Financial Crisis and the Canterbury earthquake - and on the whole dealt with them calmly and competently.
His handling of the Pike River disaster, however, was less compelling and his record has been threatened by the crisis in housing affordability and homelessness, by the growing sense of a society where significant numbers are left behind, and by the excessive attention he seems to have paid to business interests at the expense of working people.
Nor can it be said that his government has succeeded in the overdue task of re-balancing the New Zealand economy.
Our current supposed "success" is still far too dependent on excessive borrowing, consumption and imports, while productivity, investment and exports languish. And "the deficit" on which so much attention has been focused is not the one that really matters, the deficit we have with the rest of the world - the one that means we constantly have to borrow to balance the books.
The real question about his resignation, however, is its timing. Why now? It is not as though he has another big job - perhaps on the international stage - lined up. Nor does he need time, for financial reasons, to build another career in order to provide for his family.
It could be argued, with some justice, that he took a principled decision to take the NZ public into his confidence so that he cannot be accused, after the 2017 election, of misleading them as to his intentions. But the mystery deepens when we recall that it was only a few hours earlier that he was relishing the challenge that he was to face in his own electorate from Hayley Holt.
For a Prime Minister to resign in this unexpected way must suggest that he is acting under some pressing imperative. The one he identifies is that his wife has asked him to take this step and that his children have suffered - though he must know that Max Key's foibles will still attract attention, even if his father is out of office.
If that is the reason, he is to be commended. But imperatives come in many different forms. Time will tell whether that is the full explanation.