article_snippet.sent: Mayoral runoff was the first since the city changed the way it conducts elections about 20 years ago.
article_snippet.sent: Historic election: Historic election was the first runoff race since Chicago switched to non-partisan elections 20 years ago .
highlights_snippet.sent: Mayoral runoff was the first since the city changed the way Mayoral runoff conducts elections about 20 years ago .