Stocks moved mostly higher early in the session on Wednesday but gave back ground over the course of the trading day. The S&P 500 and the Nasdaq pulled back well off their best levels but still managed to end the day at new record closing highs.The S&P 500 rose 19.43 points or 0.3 percent to 6,532.04 and the tech-heavy Nasdaq inched up 6.57 points or less than a tenth of a percent to 21,886.06.The narrower Dow, on the other hand, slid 220.42 points or 0.5 percent to 45,490.92, as Apple (AAPL) slumped follo ...