The Prime Minister's leadership within his own party is being questioned after he didn't fare well in a Taxpayers' Union poll this week. 

It has National down 2.9 points to 28.4% - but most notably, it suggests that the centre-left bloc could form a government in November. It'll be very tight though, with 61 seats for the left and 59 for the right. 

Luxon sits at 21% for preferred prime minister, while Hipkins is at 22.7%. 

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