Presidential aspirants in both parties are talking about saving the middle class. But the middle class can’t be saved unless Wall Street is tamed.The Street’s excesses pose a continuing danger to average Americans. And its ongoing use of confidential corporate information is defrauding millions of middle-class investors.Yet most presidential aspirants don’t want to talk about taming the Street because Wall Street is one of their largest sources of campaign money.Do we really need reminding about what happened six years ago?