Chicago Mayor Lori Lightfoot faces eight challengers in the city’s elections on Tuesday, a tough reelection campaign for an incumbent who made history as the first Black woman and first openly gay person to serve in the role.A former federal prosecutor who had never before run for political office, Lightfoot was something of a surprise winner four years ago, claiming an overwhelming victory in a runoff. Her four years in office have included issues with high crime rates and ongoing friction with the city’s …