In South Africa, One Question Dominates: How Much Longer Should Zuma Stay?

  JOHANNESBURG — It is, in South Africa’s political parlance, the season of the two centers of power. In December, Cyril Ramaphosa was elected leader of the African National Congress and, given the party’s pre-eminence, he immediately became the nation’s president in waiting. That left President Jacob Zuma — the former leader of the party who had backed Mr.…