Support for both Fianna Fáil and Labour is declining while Sinn Féin is increasing in popularity, according to the latest opinion poll.
The Red C poll, in tomorrow's Sunday Business Post, indicates a narrowing in the gap between the current Government and the alternative coalition of Fine Gael and Labour.
Since the last in the series of monthly tracking polls by Red C was taken at the end of February, there have been a number of political developments.
Fine Gael published part of its taxation proposals for the General Election and both the Greens and Sinn Féin held party conferences.
Sinn Féin also enjoyed a successful election in Northern Ireland and has been central to negotiations to re-establish power-sharing institutions.
This month's poll was taken before this weekend's Fianna Fáil Ard Fhéis but the party will be disappointed to be down two points to 36% support.
Fine Gael are up one point to 23% but their partners in Labour are down two to 12%.
The Greens, who could be another colour in a Rainbow government, are unchanged at 8%. While the PDs lose one point, down to 3%.
The biggest winners are Sinn Féin, up three points to 10%, while the Independents and others are up one to 8%.