Given the potential backlash if the latter happened - and the likelihood that Labour's David Cunliffe would have a hard job putting an alternative government together, Key is saying to voters that Peters will have much less leverage over National than might seem to be the case.
Peters' response yesterday was to raise the prospect of a Labour-New Zealand First government, possibly including the Greens as long as they were shut out of major portfolios such as finance. Peters' message to Key is that he, too, has options.
Of the six elections conducted under MMP, it has been pretty clear in the previous five who would be governing and with whom once the votes had been counted.
The onus will then be on Key and Peters to strike a deal if the latter holds the balance of power.
Parliament does not have to sit until November 20, allowing two months to form a government. Talks should take only two weeks.
Peters will get more goodies than the number of seats he holds will entitle him. Key will make sufficient concessions because retaining power is really National's only priority.
There will not be any talk about a fresh election because voters would not thank Peters or Key for putting the country through a repeat of the past few weeks.
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