Would raise $90B, discourage excessive risk, boost little guys
                                
                                
                                    (Newser) -
                                    Barack Obama will propose a new tax on Wall Street’s biggest banks today, in an effort to recoup losses from the bailout, give smaller banks a boost against the behemoths, and curb the excessive risk-taking that caused the financial melt-down. The firms, 50 big-time banks, insurers and traders, would...