Speaker Michael Madigan’s undisputed political power came under attack Tuesday amid new criticism over his handling of harassment complaints as the March Democratic primary increasingly turns into a referendum on his leadership. Madigan faced increasing calls for him to step down from the state Democratic chairman post he has held for two decades, as well as demands for an independent investigation of complaints that have led him to shed two top loyal political lieutenants in a week. The misconduct scandal comes as the long-serving speaker and his private interests as a property tax appeals lawyer already had been a focal...