Dow drops 647 points, cryptocurrencies plummet
                                
                                
                                    (Newser) -
                                    Wall Street closed sharply lower Wednesday, giving back a big chunk of the gains built in a three-day rally running up to Election Day. The S&P 500 fell 79.54 points, or 2.1%, to 3,748.57. The Dow Jones Industrial Average fell 646.89 points, or 2%,...