US President Joe Biden on Wednesday met the leaders of African nations that hold elections in the new year to press for a free vote. On the sidelines of a summit that has brought most African leaders to Washington, Biden and his top aides met separately with a group of six leaders as part of his democracy push. The group included Nigerian President Muhammadu Buhari, who is ineligible to seek a third term in February to lead Africa’s most populous country, and President Felix Tshisekedi of the Democratic Republic of Congo who took office in 2019 in the vast country’s first peaceful transfer of power. Also participating were Gabon’s Ali Bongo Ondimba, who has been president since 2009 after succeeding his longtime-ruling father, and the leaders of Liberia, Madagascar and Sierra Leone, according to the White House. Jake Sullivan, Biden’s national security advisor, said ahead of the meeting that the president would call for free elections across the continent. He said the parti...