Conversation so far:
What did Willie Brown do for mass transit?
One of Brown's central campaign promises was his 100-Day Plan for Muni, in which he boasted he would fix the city's municipal bus system in that many days
Did Willie Brown improve mass transit?
Yes, with the help of voter-approved initiatives

Question: What were some of the mistakes he made?
Self-contained rewrite: What were some of the mistakes Willie Brown made?