Sinn Féin's popularity has plummeted by five points according to a new opinion poll.
It now leaves them 18 points behind leaders Fine Gael.
The latest Red C opinion poll for the Sunday Business Post has them at 13% - a decrease of five points.
It comes a fortnight after party leader Mary Lou McDonald posed behind a controversial banner reading "England get out of Ireland" at the St. Patrick's Day parade in New York.
Meanwhile, support for Fine Gael is unchanged at 31%, while Fianna Fáil are on 25%, up one point.
The Social Democrats, the Independent Alliance and the Green Party all sit on 3%, with Solidarity-People Before Profit on 2%.
The Independents and Labour are unchanged on 15% and 5% respectively, while Renua and Peadar Tóibín's new party Aontú are on less than 1%.