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Pedestrians walk past a mural in favour of same-sex marriages in Dublin on May 21, 2015. Ireland goes to the polls tomorrow to vote on whether same-sex marriage should be legal, in a referendum that has exposed sharp divisions between communities in this traditionally Catholic nation. AFP PHOTO / PAUL FAITHPAUL FAITH/AFP/Getty Images
Pedestrians walk past a mural in favour of same-sex marriages in Dublin on May 21, 2015. Ireland goes to the polls tomorrow to vote on whether same-sex marriage should be legal, in a referendum that has exposed sharp divisions between communities in this traditionally Catholic nation. AFP PHOTO / PAUL FAITHPAUL FAITH/AFP/Getty Images

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    Ireland could be first to legalize gay marriage by vote

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Ireland could be first to legalize gay marriage by vote

Irish voters take to the polls to decide if their constitution should be amended to allow same-sex marriage. CNN's Phil Black reports.

Ireland could be first to legalize gay marriage by vote

Irish voters take to the polls to decide if their constitution should be amended to allow same-sex marriage. CNN's Phil Black reports.