Their sudden opposition to change doesn't ring true and they are mistaken if they believe they will ride some imaginary wave to government by barking at every passing car.
That's because people vote for hope, optimism and the promise of something better.
While the flag decision may seem symbolic for most people, not affecting their daily lives in any way, Key's support for change is certainly an optimistic embrace of New Zealand's modern identity. After seven years in office, he gives off the impression that he is positive about our future.
The next month or so gives Andrew Little the chance to show that he, too, is ready for government by locking arms with Key and helping him to victory on the flag.
Little's intervention may be decisive and that in itself would show that he can deliver, even from opposition.
I'm unapologetically in favour of a new flag, and there's no way I want to pass up the chance to redefine New Zealand's national identity.
Positive change is hard to achieve, and opposing it is always easy. If Little is to succeed he needs to lead, demonstrating statesmanlike qualities, and do something that has a lasting impact for our country.
If Labour is to be elected in 2017 it will presumably be on a programme of progressive reform in the social sector as well as sharing economic returns more fairly.
For most New Zealanders to switch on to Labour, Little is going to have to do something bold to capture their imagination. That's the only way he will effectively be able to sell Labour to an electorate that doesn't seem interested in giving the party a vote much above 30 per cent.
Moreover, if the polls don't change for Little in 2016, they are unlikely to budge much for him in 2017 unless he does something different.
He cannot afford to tolerate a "new normal" in our country which appears to be Labour polling in the early thirties and National in the late forties.
For Labour to bend this curve, he needs to be ambitious, hopeful and, most of all, he needs to present an agenda of positive change - and that doesn't mean targeting certain ethnic groups based on their surname.
One of the key symbols of New Zealand nationhood is a worthwhile place for him to start, showing the kind of leadership New Zealanders are waiting to see.
• Nick Leggett is Mayor of Porirua City and a member of the NZ Labour Party