This essay serves as an analysis of South Africa's dominant-party system. We address three questions. First, what accounts for the sustained electoral dominance of the African National Congress (ANC) and what does the ANC's current decline in voter support indicate? Second, what can we learn of the nature of South Africa's dominant-party system in comparison to its southern African neighbor, Zimbabwe (an illiberal dominant-party system of the most malevolent kind)? The third question explores how the nature of the ANC's dominance affects the quality of government in South Africa. We find that the implication of the decline in support for the ANC-that South Africa may be moving toward a more competitive political system-is potentially positive, as competition should encourage greater accountability and pressure to deliver. But also it is potentially negative. The ANC's response and the resources on which it depends for power and for governing are key determinants of this trajectory. If the ANC embraces quality of government on the basis of impartiality, its material resources will be both sustainable and a benefit to society as whole. If, however, the ANC becomes conflated with the state in the minds of those deriving benefit from political appointments as well as material resources (as happened in Zimbabwe), South Africa will become vulnerable to radicalism and populism.