New Zealand Prime Minister Jacinda Arden, who was one of the first members of her generation elected as a national leader and became a global icon of the left, said on Thursday she was leaving office after five and a half years. Ardern was praised around the world for her handling of the nation's worst-ever mass shooting and the early stages of the coronavirus pandemic. But she was facing mounting political pressures at home and a level of vitriol from some that hadn't been experienced by previous New Zealand leaders. Still, her announcement came as a shock throughout the nation...