A high-stakes effort to revive a Catholic-Protestant government for Northern Ireland has ended in failure, but hope remains of an eventual breakthrough, the prime ministers of Britain and Ireland said Saturday. Britain’s Tony Blair and Ireland’s Bertie Ahern had tried for three days to broker an agreement between Sinn Fein, the Irish Republican Army-linked party, and the Democratic Unionists, who represent most of the province’s British Protestant majority. But for the third time in two years, a negotiating marathon led by the two premiers failed to break the deadlock.Full Story