U.S. stocks moved higher on Wednesday, building on Tuesday's record closing levels in the S&P 500 and the Dow Jones Industrial Average. 'There is enough here to justify a continued push higher,' said Jasper Lawler, a market analyst with CMC Markets, based in London. Reports suggest Amazon's (AMZN) - Get Amazon.com, Inc. Report Prime Day was disappointing, with sales estimates in-line with last year. Tech glitches also interrupted the shopping experience on Tuesday. Yelp (YELP) - Get Yelp Inc Report was downgraded to underperform from market perform by analysts at Wells Fargo amid worries about margin expansion. TheStreet's Scott Gamm reports from Wall Street.