Market recap: An 8-day rally is history as stocks finish marginally lower. The Dow wasn't helped by Coca-Cola, which fell after Q2 revenue missed estimates and unit case volumes fell in Europe and North America. Shares of Tesla fell hard after Goldman said the stock's valuation was only warranted in the best case scenario. Speaking of Goldman, the firm's Q2 came in above consensus, but shares slid after a downgrade and questions were raised about the quality of the beat. Johnson & Johnson topped estimates despite pressure on device sales. Bernanke begins his testimony on Capitol Hill tomorrow.