Frontman Bono slightly altered the lyrics to the song to reference the results of a referendum on same sex marriage during the band's gig in Phoenix, reported Rolling Stones magazine.
"We have peace in Ireland today! And in fact on this very day we have true equality in Ireland!," he said,
In what was a huge turn-out, more than 60 per cent of Irish voters agreed gay marriage should be legal, and the results sent shock waves through the celebrity world with stars like Miley Cyrus and Sam Smith celebrating the historic victory for gay rights activists.
May 14.
