Lindiwe Mazibuko - Leader of the Opposition in the South African Parliament

The African National Congress has dominated politics and government in South Africa since the end of apartheid nearly 20 years ago. Sarah Montague talks to Lindiwe Mazibuko, the parliamentary leader of the largest opposition party, the Democratic Alliance. What chance does it really have against the ANC, the party of liberation, which is still seen as the natural home of black voters?