Now it's looking like a trend. This must be absolutely gutting for Simon Bridges.
No-one's buying his response response last night - that he likes the fact New Zealanders like his team. This is another nail in his coffin. Is it the final one?
Ardern is miles out in front, on 41.8 per cent support as preferred PM.
The KiwiBuild debacle, the Karel Sroubek mess, capital gains tax - none of these things have put voters off it seems. Yet.
Labour's at 47.5 per cent, up 4.9, ahead of National at 41.6 per cent, which is a drop for them of 3.5.
The Greens sat at 5.1 per cent; NZ First (and Winston will not be at all happy about this) was at 2.9 per cent.
Winston's response will be interesting. Can he poopoo the poll as rogue when it gives good numbers to his coalition partner and PM? Probably not. He will have to suck it up.
But a poll that shows NZ First wouldn't even be in Parliament on these numbers, and that the Greens and Labour could govern alone, will be a very bitter pill for him to swallow.
So what is it voters don't like about Simon Bridges? Is it the voice? Is it his perceived weakness? Is it his inability to bat away Jami-Lee Ross?
Is it just bad luck being the guy who had to follow John Key? Is it that people still don't know him? Or is it just that National's base likes strong sassy and old-school - in the form of a Judith Collins?
As I've said before, I'd go for Mark Mitchell. But who takes the helm here, and whether it can remain Bridges, will be a big job for National to nut out over the coming days.