JOHANNESBURG (AP) — The race to lead South Africa's scandal-weakened ruling party, and likely the country, has put the future of the African National Congress in question. The rift between the top candidates is so pronounced that some observers warn the party of Nelson Mandela could split in two. Here's a look at the leading contenders to succeed President Jacob Zuma and lead the party toward the 2019 elections: ___ DEPUTY PRESIDENT CYRIL RAMAPHOSA One of South Africa's richest businessmen, the 65-year-old Ramaphosa is a veteran of the struggle for liberation from the country's former apartheid system of white minority rule and helped negotiate the transition to democracy.