That celebratory mood faded fast. Though Zuma survived the most serious attempt yet on his leadership, allegations of corruption and poor governance have significantly weakened the ANC, the once potent party of Nelson Mandela, observers say.
The ANC, instrumental in ending South Africa's apartheid regime of racial discrimination, has ruled since the country's first all-race elections in 1994.
But its support has eroded since Zuma came to power in 2009 as South Africans have vented their frustration at the ballot box over high unemployment and a lack of basic services like water and electricity.
That public display of internal rebellion also highlights the party's bruising battle to succeed Zuma, who will step down as ANC leader in December. A steady stream of ANC members and anti-apartheid veterans have publicly urged Zuma to step aside before then, as anger grows among voters over scandals that included millions of dollars of public money spent on Zuma's private home.
The developments have chipped away at the ANC's decades- old moral authority, while "pro" and "anti" Zuma factions within the party fight for control and prepare for the 2019 national elections.
"The ANC works on the assumption it can pull together a credible campaign in the future, and that the core of the ANC is still there," said Susan Booysen, a professor of politics at the University of Witwatersrand.
The ANC's vote share dropped from nearly 70 per cent in the 2004 national elections to just over 62 per cent in 2014.
The party had its worst-ever showing in the August 2016 local elections, losing control for the first time of the commercial hub of Johannesburg, capital Pretoria and Port Elizabeth.
That prompted party leaders to declare they would "introspect" to understand why voters are turning their backs on the party. In the parliament debate before this week's no- confidence vote, at least one young member warned that South Africa's upcoming generation of voters would look elsewhere.
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