Jacinda Ardern, the rare politician who knew when to quit
Stephen Collinson writes: “Nothing in his life became him like the leaving it,” William Shakespeare writes of an executed rebel in “Macbeth.” Today’s leaders, however, often struggle to embrace an equivalent vision of a dignified exit from political life when their time comes. Jacinda Ardern is the rare leader who is choosing to leave the stage, not to be pushed off it. New Zealand’s prime minister said Thursday that she had “no more in the tank” after five years in…