Nigeria: What to Know About Nigeria's Election

[VOA] Voters in Nigeria, Africa's most populous nation, head to the polls Saturday to cast ballots in presidential and parliamentary elections. President Muhammadu Buhari, who is in his second term in office, is not eligible to run again after serving the maximum of eight years in office. There are three main presidential candidates running to succeed him and the race is seen as the most competitive since the country switched from military rule to democracy in 1999. Here is what to know about the elections: