LAWRENCE, Mass. (AP) — Sen. Elizabeth Warren is expected to formally launch her presidential bid in this working-class city on Saturday with a populist call to fight economic inequality, a message she hopes will distinguish her in a crowded Democratic field and help her move past the controversy surrounding her past claims to Native American heritage. The Massachusetts Democrat will announce her 2020 plans at a mill site where largely immigrant factory workers went on strike nearly 100 years ago, providing the longtime consumer advocate a fitting forum to advance her political platform. In a video announcing Saturday's event, Warren...