When John Key became our 38th Prime Minister on November 8, 2008 it was an extraordinary turnaround from the previous election.
In 2005, New Zealand chose Labour with two seats more than National. Three years later, National took the helm with 58 seats to Labour's 43 and Key's leadership has kept the country wrapped in a blue ribbon ever since.
Whether he has ridden a wave of popularist middle-ground politics or he built that wave will be better left to a day much later to judge.
As is the world we live in, there are any number of fanciful theories behind Key's surprise announcement. The simple fact is, the job of Prime Minister is extraordinarily stressful.
Key cited family reasons for leaving, saying the job had required great sacrifices "from those who are dearest to me". His wife Bronagh had endured "many lonely nights" and his children Stephie and Max had been put under "extraordinary levels of intrusion".