Conversation so far:
who was the mayor?
Anderson ran for Mayor of Salt Lake City in 1999, defeating 10 other candidates in the primary campaign.
Are there any other interesting aspects about this article?
Anderson's two terms in office were extremely eventful, with Anderson playing a leading role in hosting the 2002 Winter Olympic Games.
did they win any awards?
CANNOTANSWER.
when did he leave office?
Anderson chose not to run for a third term to be able to push for reforms of U.S.
human rights policies and practices through grassroots organizing.
when was the third term?
CANNOTANSWER.
did the vote pass?
63% of the city population voted against banning same-sex marriage, in agreement with Mayor Anderson.
was he married?
CANNOTANSWER.
did he have children?
CANNOTANSWER.

Question: what was his biggest accomplishment?
Self-contained rewrite: what was Anderson´s biggest accomplishment?