Conversation so far:
How did Helen Zille fight against drug and alcohol abuse?
In March 2008, Helen Zille took her anti-drugs campaign to Johannesburg, leading a protest march.
Did Helen Zille succeed in her campaign against drug and alcohol abuse?
It is not clear that Zille's activities have had any particular impact on problems of crime and substance abuse in the Western Cape.
Who else supported Helen Zille in her campaign?
Helen Zille was a campaign favorite from the start with backing from the Western Cape, Gauteng, KwaZulu-Natal, Mpumalanga, the Northern Cape, the Free State and even the Eastern Cape.

Question: what was the ultimate gain of this campaign?
Self-contained rewrite: What was the ultimate gain for Helen Zille's campaign to succeed outgoing leader of the DA, Tony Leon?