The latest opinion poll shows Fine Gael maintaining a commanding lead less than three weeks from polling day.
The findings of the latest Red-C poll will be published in the Sunday Business Post tomorrow and compared to the paper's last poll, Fine Gael are up by two to 35%.
However, polling was conducted before the refusal of Enda Kenny to take part in the Vincent Browne TV3 debate.
Tomorrow's poll shows Labour up 1 to 22%, Fianna Fáil up 1 to 17%, Sinn Féin are unchanged on 13%, while independents are down 4% to 11%.
The Greens are unchanged on 2%.