Hone Harawira, seen speaking in the house after been sworn in in 2011, slightly trails an as-yet unnamed Labour candidate, a new poll finds.

Mana leader Hone Harawira is under pressure to hold his Tai Tai Tokerau seat with a new poll showing him running a close second to a yet-to-be-selected Labour candidate.

The Te Karere-Digipoll asked voters when they choose their local MP which party would the candidate likely come from.

Labour had the edge with 32 per cent over Mana with 28 per cent.

A Maori party candidate would get 14 per cent, the survey found.

Harawira held the seat in 2011 with a 1165 majority over Labour's Kelvin Davis.

The poll had Green and National candidates on 3 per cent each and NZ First on 2 per cent.

Another 18 per cent were either undecided or picked another option, but the pollsters did not provide a breakdown.

When it came to the party vote Labour was backed by 30 per cent, Mana by 19 per cent and the Maori Party 19 per cent

National scored 6 per cent, the Greens 8 per cent each and NZ First 3 per cent.

Fourteen per cent were undecided.

With undecideds taken out, Labour was on 35 per cent of the decided vote (34.7 per cent at the 2011 election), with Mana on 22 per cent (24.5 per cent in 2011) and Maori on 22 per cent (11.2 per cent in 2011).

There was strong backing for Harawira's performance as the local MP with 14 per cent rating it "fantastic", 39 per cent above average and 31 per cent average.

Only 12 per cent rated it either below average or poor.

The survey of 500 had a margin of error of 4.3 per cent.