He sweeps 5 states, stakes claim to GOP nomination
                                
                                
                                    (Newser) -
                                    Is tonight the night that knocks out Newt Gingrich once and for all? Mitt Romney has won Delaware, billed as Gingrich's last-gasp chance, as part of a five-state sweep, according to the  Wall Street Journal . In addition to Delaware, Romney won Connecticut, New York, Pennsylvania, and Rhode Island. He...