Failed promises by Labour may be contributing to their slip in the polls.

The latest 1 News Verian poll sees the party drop to 29 percent -- and National rise to 37.

The Greens are up two points to 12 percent while Act is up one, to 13.

Political commentator Peter Dunne told Kate Hawkesby there's a series of big pledges made before the 2017 election that haven't been fulfilled, like KiwiBuild and Auckland light rail.

He says now Labour is making some big aspirational promises and people must be wondering, why should we believe you this time?

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