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That means National, while still in the 40s, is trailing Labour which is up two points to 45%, according to the latest 1 NEWS Colmar Brunton poll.
Prime Minister Jacinda Ardern has jumped five points to 44% support as preferred prime minister in the poll, which was taken between February 9 and 13.
National frontbencher Judith Collins, who topped Bridges as preferred prime minister in last week's Newshub Reid Research poll, is steady on 6% support as preferred prime minister in the 1 NEWS poll. That puts her neck and neck with her leader.
The gap between Labour's support partners the Green Party and New Zealand First has widened since the last 1 NEWS Colmar Brunton poll in December. The Greens are up 1 point to 6% while New Zealand First is down a point to 3% - two points under the 5% threshold that would get it into Parliament in an election.
New Zealand First leader Winston Peters also dropped a point in the preferred prime minister stakes to 3%.
It was not all good news for Labour though. Optimism about the economy dropped 2 points from last year's poll to 35% while pessimism was up 1 point.
National's 1 NEWS poll result is similar to last week's Newshub Reid Research poll which had National under Bridges' leadership diving to its worst result in more than a decade, falling 3.5 points to 41.6%.
That was well behind Labour which jumped 4.9 points to 47.5% in the Newshub poll.
It showed an even worse result for Bridges, on 5% support as preferred prime minister compared with Collins on 6.2% and Ardern on 41.8%.
Prior to last week's Newshub Reid Research poll, its last poll was taken just before the May Budget last year.