Key Points:

Both major parties' support has risen slightly in the latest political poll, at the expense of the smaller parties.

The latest New Zealand Morgan poll, published today, puts National on 50 per cent support, up three points from a fortnight ago, while Labour trails on 35.5 per cent, up one point.

Both major parties' support has hovered in a similar region for several months now.

The Greens' support drops in the poll to 6.5 per cent, down 2.5 percentage points, while New Zealand First and the Maori Party both drop half a point to 3.5 per cent and 2.5 per cent respectively.

ACT's support remained unchanged on 1.5 per cent as did United Future's on 0.5 per cent.

The Progressive Party failed to register a rating.

The poll of 861 voters was taken between April 7 and April 20.

It follows two varying polls at the weekend.

One gave National a 19-point lead, while the gap in the other was just 10 points.

TV One's Colmar-Brunton poll had National on 54 per cent support with Labour trailing on 35 per cent support.

TV3's TNS poll put National on 48 per cent support and Labour on 38 per cent.