The poll, conducted earlier this week, shows 37pc saying they will vote Yes, with 24pc in the No camp. But 35pc of voters say they still don't know how they will vote, while just 4pc say they won't vote.

When the don't knows are excluded, it is 60pc Yes compared with 40pc No.

The referendum is there for the taking by the Yes side, but the Government will know there is no room for complacency.

The poll results also reveal that the Yes vote is being driven by Fine Gael and Fianna Fail voters.

But Tanaiste Eamon Gilmore has a battle on his hands to convince a sizeable block of Labour supporters to back the treaty.

Labour voters lag behind Fine Gael and Fianna Fail voters in their backing of the treaty.

Fianna Fail leader Micheal Martin has seen off the rebellion of dissident TD Eamon O Cuiv calling for a No vote.

Support for the Yes side is also shown to be highest among older voters and those in the affluent and middles classes.

But after three weeks of debate on the EU fiscal treaty referendum, voters are still limited in their knowledge of what they are deciding on.

Against the backdrop of the ongoing instability in Greece and the threat to kick that country out of the euro, the poll also shows Irish voters want to stay in the eurozone.

Euro

A substantial majority, or three out of every four voters, want Ireland to remain in the single currency.