But then Labour started flirting with the idea of governing with New Zealand First, thereby shutting out the Greens, who, having nowhere else to go, would still be obliged to enter a confidence and supply arrangement.
While the move was clever in potentially denying National a coalition partner, it left something of a vacuum on the centre-left as to the form and shape of an alternative Government.
Worse, since David Cunliffe replaced Shearer a year ago, support for Labour has tumbled by around 10 percentage points. That has effectively made it impossible for Cunliffe to form any sort of viable Government.
The Greens face an old dilemma: remain pure but powerless. Or go centrist and compromise and get things done.
If the Greens want to be able to negotiate with National as well as Labour, they are going to have to compromise by putting much of their social justice agenda on the backburner and pushing their environmental credentials harder.
One possibility would be to move to the cross benches and abstain on confidence and supply motions, thus possibly making National less reliant on Winston Peters and New Zealand First.
What the Greens cannot afford is to be sidelined again in 2017 in the way they have been in 2014. Tough decisions lie ahead.
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