Rival delegates have been noisily championing their candidates
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Members of South Africa's governing ANC are to choose a party leader in a contest between President Thabo Mbeki and his bitter rival Jacob Zuma. The vote at the party's conference comes after two days of debate that revealed the deep divisions.
Proceedings have been rowdy despite appeals for unity from ex-President Nelson Mandela. Mr Zuma is the favourite to win.
The vote has a significant influence on who will become the next president.
Some had hoped a compromise candidate would be nominated to help end the divisive contest between Mr Mbeki and his former ally, the BBC's Will Ross reports from the conference in the northern town of Polokwane.
But there were no new nominations and on Tuesday almost 4,000 members of the African National Congress will have to choose between the two men.
Kingmaker vote
After two terms in office, President Mbeki is obliged to step down but should he win the party leadership contest he could work to prevent Mr Zuma from reaching the presidency.
| LEADERSHIP RIVALS Thabo Mbeki, 65 Succeeded Nelson Mandela as president in 1999 Presided over economic growth Accused of not doing enough to reduce poverty Won bid to host 2010 football World Cup Seen as aloof From Xhosa ethnic group Jacob Zuma, 65 Played key role in fight against apartheid Plagued by corruption allegations Backed by trade unions, Communist Party Seen as charismatic From Zulu ethnic group |
It has been the most divisive contest in the long history of the ANC, our correspondent says.
For some this is a sign of a healthy democracy in action while others, he says, fear the split in the ANC could spell trouble for South Africa.
Delegates were warned to behave or face disciplinary action on Monday after rival supporters tried to out-sing each other amid chaotic scenes.
Zuma supporters sang the anti-apartheid song Bring Me My Machine-gun, during pro-Mbeki speeches while Mbeki supporters retorted by singing Mbeki, My President.
Mr Mbeki had been booed and heckled during his opening speech on Sunday.
Jeff Radebe, a member of the ANC's national executive committee, said "appropriate action" would be taken if booing persisted.
"Intimidation is beginning to affect our people," said one Mbeki supporter, Deputy Defence Minister Mluleki George.
Mandela 'saddened'
It will be the ANC's first leadership contest in 58 years.
| South African viewpoints
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In an address lasting nearly three hours on Sunday, Mr Mbeki did not mention Mr Zuma by name but stressed the need for "ethical leadership".
Mr Zuma has been warding off allegations of corruption and last year was acquitted of rape charges - which he said were politically motivated.
Mr Zuma provoked outrage among Aids activists over the case when he said he had showered after sex with the HIV-positive woman to prevent infection.
Mr Mbeki said claims by the Zuma camp that he had centralised power were false.
Mr Mandela has said he is saddened by "the nature of the differences currently in the organisation".
On Friday, the former Archbishop of Cape Town, Desmond Tutu, said neither Mr Zuma or Mr Mbeki were suitable candidates.
Once close allies, Mr Zuma and Mr Mbeki publicly fell out in 2005 when Mr Zuma was sacked as deputy president over corruption allegations.
The case against Mr Zuma was thrown out by a judge last year but he could still face charges in connection with a multi-million dollar arms deal.
Mr Zuma's supporters believe he would do more to reduce poverty in South Africa.