Delaware's Tom Carper won't run again, opens way for another Black female senator
                                
                                
                                    (Newser) -
                                    Another longtime Democratic senator is retiring, the fourth in this election cycle. Tom Carper of Delaware announced his decision on Monday, reports  Politico . The 76-year-old, who serves as chairman of the Senate Committee on Environment and Public Works, first won the seat in 2000, per the  Delaware News Journal . He...