Key is also making it clear that the referendum will not be allowed to "intrude" on the 2017 election - just as it will not interfere with this year's ballot.
However, despite Key having canned any thought of holding a referendum on the same day as the September 20 general election, the Prime Minister's critics say his push to change the flag has already done so.
They see Key as using the flag to surreptitiously tap into the rich veins of patriotism and national identity that lurk in voters' subconscious. Those critics argue that if Key did not want the referendum to intrude on this year's election, why did he announce the details of his flag-change plan less than 24 hours after announcing the date of the election.
His critics will also interpret Key's initiative as a means of painting National as a progressively-minded party appealing to younger and liberal-minded voters who under normal circumstances would by now be aligning themselves with Labour.
The biggest plus for Key, however, in advocating a fundamental change in the national symbol is that they are witnessing Key displaying a crucial attribute in determining how people vote - leadership. And you cannot put a price on that.
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