DUBLIN, IRELAND - MAY 23:  Supporters in favour of same-sex marriage pose for a photograph as thousands gather in Dublin Castle square awaiting the referendum vote outcome on May 23, 2015 in Dublin, Ireland. Voters in the Republic of Ireland are taking part in a referendum on legalising same-sex marriage on Friday. The referendum was held 22 years after Ireland decriminalised homosexuality with more than 3.2m people being asked whether they want to amend the country's constitution to allow gay and lesbian couples to marry.  (Photo by Charles McQuillan/Getty Images)