Same-sex marriage in Northern Ireland the second attempt to introduce same-sex marriage was defeated by the Northern Ireland Assembly 53-42, with the Democratic Unionist Party and Ulster Unionist Party voting against and Sinn Féin, the Social Democratic and Labour Party, Alliance and the Green Party voting in favour. The third attempt on 29 April 2014 was defeated 51-43, with all nationalist MLAs (Sinn Féin and SDLP), most Alliance MPs and four unionists (two from NI21 and two from UUP) in favour. The remaining unionists (DUP, UUP, UKIP and Traditional Unionist Voice) and two Alliance MLAs voted against. A fourth attempt on 27 April 2015 also
Northern Ireland peace process would not be a majority (or only a slim majority) of the unionist community in favour of the agreement, and that its credibility would be thereby undermined. In the Republic of Ireland, the results of the vote to change the constitution in line with the agreement were: In Northern Ireland, the results of the vote on the agreement were: There is no official breakdown of how the nationalist and unionist communities voted, but CAIN, the Conflict Archive on the Internet, estimated that the overwhelming majority (up to 97%) of members of the largely Catholic nationalist community in Northern Ireland voted