A new poll reveals Maori Party co-leader leader Pita Sharples huge majority in the Tamaki Makaurau electorate is being seriously eroded.

Horizon Research says his majority of 7,540 appears to have slipped to about 1,140.

The poll shows Mr Sharples would get 47.8 per cent of candidate votes in the largely Auckland-centred electorate while his new Labour opponent, Shane Jones, would get 42.1 per cent.

In the party vote contest in the seat, Labour would remain a clear winner.

- Newstalk ZB