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South Africa's ANC challenged by new party, Agang

21 June 2013 Last updated at 07:52 BST

One of South Africa's most prominent women, Dr Mamphela Ramphele, officially launches her political party Agang on Saturday, with the aim of attracting disillusioned ANC voters.

Promising to tackle corruption, grow the economy and represent those being left behind in society, she still faces an uphill struggle against the party of former President Nelson Mandela.

Karen Allen reports from Johannesburg.