One of their leaders declared: "We repudiate the Dail", the Irish parliament, which accepted the compromise agreement.
In one recent Dail debate Cork Sinn Fein TD Jonathan O'Brien said his party was pro-life.
The Irish parliament, or Dail, is elected by proportional representation, using the single transferable vote system.
Despite a complex voting system, party strength in the Senead usually reflects that in the Dail.
Ireland's Senead has 60 members chosen for five-year terms, the same as the lower house, the Dail.
Irish Taoiseach Bertie Ahern told the Dail this week that was true.
Mr Ahern told the Dail on Wednesday he believed the governments' proposals over photographs continued "to represent a fair and reasonable judgment".
BBC: NEWS | UK | Northern Ireland | 'Arms photo reasonable': Ahern
Sinn Fein's Dail representation will almost certainly increase from its current 5 seats, some commentators believe they could get as many as 13.
The Senead is supposed to introduce and revise legislation, but it cannot veto legislation passed by the Dail, where almost all power resides.
But its forecasts of a doubling of its seats in the Dail to ten crashed: the party actually lost one of its five seats.
In the Republic of Ireland, according to figures reported by a Dail committee that investigated the issue, the authorities lose about 150m euro each year.
BBC: Fuel laundering 'costs tens of millions' to governments
But then came the Easter Rising, Sinn Fein's victories in the 1918 election, the formation of the First Dail and the War of Irish Independence.
Sebastien's dad, Paul Conway, a senior official at the Dail (Irish parliamnet), will also be supporting the underdog boys in green against their more individually-talented rivals.
Mr Ahern told the Dail that Downing Street was aware that on Tuesday morning he was reluctant to travel to Hillsborough because of concerns about the decommissioning element.
BBC: NEWS | UK | Northern Ireland | Ahern 'foresaw arms deadlock'
Mr Adams apologised for the attack in the Irish parliament (Dail) as he paid tribute to another officer shot dead during a robbery in his constituency last Friday.
BBC: Jerry McCabe: Adams apologies to family over the killing
Mr Adams is rumoured to be considering standing for a seat in the Irish parliament (the Dail) in County Louth, just south of the border with Northern Ireland.
But he fell to the persuasions of the headhunters of Fianna Fail, who were looking for a popular candidate for a Cork seat in the Dail, the Irish parliament.
Irish Prime Minister Enda Kenny told the Dail that doctors with no connection to Galway University Hospital would be appointed to replace the ones removed from the inquiry panel.
The secretary general of the Department of the Environment, Geraldine Tallon, told a Dail committee on Thursday that the final bill could range from 204m euros to 250m euros.
Speaking in the Irish Parliament, the Dail, on Wednesday night, Irish Justice Minister John O'Donoghue said that the very suggestion of political interference in the Omagh investigation was "simply horrifying".
When Sinn Fein pressed the issue in the Dail, the Irish parliament, last autumn, one of its TDs, Peadar Toibin, from Meath West, rebelled and refused to vote with his party.
He told the Dail that the death of Detective Garda Adrian Donohoe had provoked memories of the killing of Garda McCabe and the wounding of his colleague, Garda Ben O Sullivan.
BBC: Jerry McCabe: Adams apologies to family over the killing
Psephologists who have pored over the results reckon that a similar performance in the next general election might be enough to give them as many as five seats in the Dail.
Buoyed by polls predicting at least 70 seats for Fine Gael in the 166-seat Dail, Enda Kenny spent Thursday in counties Donegal and Sligo, before returning to his home in Castlebar, Mayo.
The Irish Cabinet will then go to the Irish parliament, the Dail, where it will complete the removal of articles two and three of the Irish Constitution which lay claim to Northern Ireland.
These later included the man who went on to found the Welsh folk museum at St Fagans, scholar and poet Iorwerth Peate, whose former home in Lon-y-Dail is now honoured with a blue plaque.
BBC: Rhiwbina garden village in Cardiff celebrates centenary
With the Irish government hoping to have its proposed bill made law by the Dail (Irish parliament) summer break in July, both pro-choice and anti-abortion campaigners are getting ready for a battle lasting several months.
BBC: Battle between anti-abortion and pro-choice campaigners
The commission, formed by Irish Chief Justice Liam Hamilton and the speakers of the Dail and the Senate, Seamus Pattison and Brian Mullooly, signed the documents that officially entered the bill into the statute book.
We do not yet know exactly what Angela Merkel means by "fiscal union" but we had a dress rehearsal when a Bundestag committee learned details of a rise in Irish VAT weeks before the Irish Dail.
The "rebel countess" was the first woman to be elected to the Commons, in 1918 - but as a Sinn Fein candidate she didn't take her seat and became a TD in the first Dail, instead.
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