Several hundred protesters again amassed on the streets of Chicago in response to the city’s release of a squad-car video showing a white police officer fatally shooting a black teenager.  Officer Jason Van Dyke is charged with first-degree murder for the 2014 death of 17-year old Laquan McDonald, who was shot 16 times.  Hundreds of people have participated in demonstrations in and near downtown Chicago, including City Hall, since the video was released.  Police say nine people have been arrested, and a charge of aggravated battery of a police officer was dropped against one person on Wednesday.  A large protest is planned today at the city’s famed Michigan Avenue shopping area.