The first political opinion poll of the New Year shows Fine Gael maintaining a five point lead over Fianna Fáil, although support for both parties has dropped slightly.
The Greens made the biggest gains in the Red C poll for tomorrow's Sunday Business Post.
Support for Fianna Fáil has dropped two points, to 28%, since the last Red C poll in November.
Fine Gael support is also down two to 33%, but it retains a five point lead over the main Government party.
Labour are unchanged at 14%, while the Greens, after a week of high-profile resignations and criticism of the leadership, have seen their support almost double - up three to 8%.
Sinn Féin gain one to 9%, while Independents and others are unchanged at 8%.
58% of those polled said they would support the Lisbon Treaty, compared to 28% who said they would not, with 14% undecided. These results represent a two to one majority for the Yes side.