Lori Lightfoot, Chicago's first openly gay mayor, is sworn in Chicago's first openly gay mayor - who is also the first black woman to hold the post - takes office with a promise to clean up corruption and tackle pervasive gun violence in America's third-largest city. Lori Lightfoot, who shocked the establishment with her come-from-behind electoral win, is sworn into office in a high-profile inauguration at a Chicago sports arena. IMAGES AND SOUNDBITES