U.S. stocks turned in a lackluster performance Wednesday, but this session goes down in the record books as the day that marked the longest bull market run in history.The current bull market began on March 9, 2009, when the S&P 500 was at 676 points, hard hit by the Great Recession.Nine and-a-half years later, and the S&P 500 has rallied about 323 percent. The tech-heavy ...