If the National Party's worst case scenario happens and Jacinda Ardern becomes Prime Minister with Winston Peters as her deputy, the game-changing moment may be traced back to when John Key resigned at the height of his powers.
While he was probably right, for his own legacy, to leave at the height of his powers, it could prove disastrous for his party.
The key problem is that as much as National would like you to think that elections are all about having a stable economy, they are not - it is increasingly all about personality.
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And Sir John was probably the politician who brought about this change by making X-Factor a factor in who we choose to lead us. Also, when he left, he created a personality vacuum in the National Party and, more importantly, in New Zealand politics.