DUBLIN, IRELAND - MAY 23:  People celebrate a landslide victory of a Yes vote after a referendum on same sex marriage was won by popular ballot vote by a margin of around two-to-one at Dublin Castle on May 23, 2015 in Dublin, Ireland. Voters in the Republic of Ireland chose in favour of amending the country's constitution to allow gay and lesbian couples to marry, the first country in the world to legalise same-sex marriage through a popular vote.  (Photo by Clodagh Kilcoyne/Getty Images)