Liadh Ní Riada took Sinn Féin's second Irish seat in the Ireland South constituency, while Matt Carthy is still in the running in the Midlands North West constituency.On Monday, Fine Gael's Brian Hayes, Fianna Fáil's Brian Crowley and two Independent candidates Luke 'Ming' Flanagan and Nessa Childers were also elected.Sinn Féin has candidates in each of Ireland's three European constituencies, as well as in Northern Ireland where Martina Anderson retained her seat after topping the poll.Sinn Féin's Lynn Boylan became the first Irish MEP after she was elected in the Dublin constituency on Sunday evening.She received more than 83,000 first preference votes before being elected on the third count.Ms Boylan, who was cheered loudly by supporters as the results were read out at the RDS in Dublin, said it was a "fantastic" outcome for the party.And then there was 3! Maith thú Liadh. C'mon Matt. Very slow. Thats men 4U!— Gerry Adams (@GerryAdamsSF) May 26, 2014On Monday party president Gerry Adams told UTV he believed Sinn Féin would take three European seats in the Republic of Ireland."We are doing something quite unprecedented, we fought two elections," he said."Every one of the 32 counties of this island and our off-shore islands had the opportunity to vote for Sinn Féin, that's a mighty ask for us to be able to do that."Meanwhile, with 16 out of a total 949 council seats yet to be filled, Sinn Féin has also enjoyed a windfall, taking 157 seats so far.Fianna Fáil has the majority with 265 seats, while Fine Gael returned 229 councillors. Labour only managed 50 seats, while Others achieved 232.Stormont deputy First Minister Martin McGuinness has said the elections have been "stunning" for the party."The political landscape of the island of Ireland is changing and I think you will see that more dramatically at the next general election in the south given the incredible gains that they've made over the last few days," he commented.Mr McGuinness said that his party would see a "dramatic increase" in the Irish general election in 2016.He added: "In those circumstances, you have to first of all, see what your own strength is, you have to see what the strength of the other parties is, and also then establish whether or not we go into negotiations with a potential partner in government."