There is growing support for Sinn Fein after the party forced Fianna Fail into fourth place in a national opinion poll, Gerry Adams has said.
The Sinn Fein president said momentum is gathering for change ahead of the Government's austerity measures.
Fianna Fail suffered a bruising after an opinion poll put its support at just 13%. The party is now behind Sinn Fein, at 16%, according to the Red C survey for the Irish Sun.
Support for Fine Gael has fallen by 1% to 32% on a similar Red C poll carried out on November 21.
Labour's popularity has dropped from 27% on the previous poll to 24%. Support for the Greens remains unchanged at 3%.
Mr Adams said: "Following last week's excellent result in Donegal South West, I am confident that there is considerable and growing support for Sinn Fein and that we will continue to build on that."
The party's rally against Tuesday's Budget was due to be held in Dublin on Saturday but has been cancelled because of bad weather.
Mr Adams added: "Sinn Fein believes there is a better and fairer way of tackling the economic crisis and getting back to recovery. This is the message that is being picked up by Sinn Fein representatives in every constituency."
The survey of 1,000 adults was carried out on Monday, Tuesday and Wednesday this week, days after Sinn Fein's by-election win in Donegal South West and following the 85 billion euro bailout.
Red C also asked who respondents would like to see as the next Taoiseach, with only 8% backing Brian Cowen. Labour's Eamon Gilmore stands at 41% and Enda Kenny of Fine Gael at 25%.