The latest Sunday Times/Behaviour & Attitudes opinion poll suggests that Fine Gael has overtaken Fianna Fáil as the most popular party among voters.
However, the parties are separated by the narrowest of margins with just one percentage point between them.
The survey of voters carried out over a 13-day period up to last Tuesday shows Fine Gael on 29%, that is up three points on the previous poll last month.
Fianna Fáil on 28% are down one point while Sinn Féin drops four to stand on 16% support.
The Greens are up one to 6% and Labour are up two points on 5% support.
The Independent Alliance on 2% drop two points while Solidarity-PBP gains two points to bring its support to 3%.
The Social Democrats are on 1% while Independents and others are at 9% support.
The margin of error in this poll is 3.3%.