Nigeria’s national elections later this month will have major implications not only for Nigeria, but for West Africa and the continent more broadly. Ibrahim Gambari, chief of staff to the term-limited President Muhammadu Buhari, says the outgoing president has made organizing a peaceful, free and fair election process a cornerstone of the legacy he hopes to hand to his successor — and that he hopes civil society, political leaders and international partners like the United States can rally behind Nigerians as they exercise their right to vote.