Chicago Mayor Lori Lightfoot is fighting for reelection Tuesday after a history-making but tumultuous four years in office and a bruising campaign threaten to make her the city's first one-term mayor in decades.Lightfoot in 2019 became the first Black woman and first openly gay mayor of the third-largest U.S. city, and only the second woman to hold the office. But Lightfoot, a former prosecutor and head of a city police review board, now faces serious challenges from multiple candidates, who have hammered her over crime …