If John Key wants to avoid having to govern with Winston Peters perched constantly and awkwardly on his shoulder, he is going to have to help Colin Craig get his Conservative Party across the 5 per cent threshold.
That is the unambiguous message to National's leader from today's Herald-DigiPoll survey.
National's support is starting to slowly slide below the 50 per cent mark. Key would still be able to govern with Act's and United Future's two MPs - plus any Maori Party MPs who survive the election. Key would still want some insurance, however, should his party slip further during the eight days left until election day.
Key has to factor two other elements into the power equation. First, the polls may be overstating the actual level of support for Craig's party. Ticking Conservative on the ballot paper may prove more difficult psychology-wise than saying "Conservative" to a pollster at the other end of the phone line.
Second, the polls have long tended to underestimate the true level of support for New Zealand First, possibly because those who quietly back Peters find it too embarrassing to admit it. So Peters' party, which secured a very healthy 8 per cent-plus in today's poll, may well be trending around the 10 per cent mark that Peters claims it is.