. >> former fbi hostage negotiator christopher lawson thank you for being here. >> thank you. >> bernie sanders an independent and a self described democratic socialist announced his candidacy tonight. he says he wants to focus on tackling widespread economic disparity in what he called a disgraceful campaign finance system. so far secretary of state hillary clinton is the only democratic contender. >>> we'll go back to baltimore next for a look at the city's troubled schools why a senator says the schools are broken. broken. >> the powerful at times disturbing pictures coming out of baltimore this week showed teens even children rioting and throwing bricks at police. now, is the city's struggling school system partly to blame? del walters has more. >> in baltimore it came down to the a battle between brooks books and bricks. a long standing problem in baltimore: is the educational system broken? >> i think it is. i think it's broken definitely. >> she should know. before a corruption conviction forced her out sheila dixon was the mayor of baltimore. before that she was the president of