Voters in Nigeria will elect a new leader Saturday after President Muhammadu Buhari's final term ends, with 18 candidates vying to lead a country facing a series of struggles — the newest and most pressing being a shortage of cash. Three front-runners have emerged, including the ruling party’s Bola Tinubu and the main opposition’s Atiku Abubakar. Peter Obi, a third-party hopeful who has been favored in most polls, has broken the usual cycle of two-candidate races.