Fianna Fáil will formally launch its campaign for a 'yes' vote in the Lisbon Treaty referendum later today.
The vote on the treaty takes place on Friday October 2.
The party's campaign is expected to focus heavily on a posters, newspaper advertising and regular press conferences.
Labour launched its campaign for Lisbon last Monday.
Fine Gael will unveil its plans tomorrow while the Greens are expected to publish their campaign at the weekend.