U.S. stocks struggled to stay in positive territory in midday trading Tuesday despite strong manufacturing data. The S&P 500 backed off after hitting an intraday record earlier in the trading session. Shares of Compuware (CPWR) are rising better than 12 percent after the company agreed to sell itself to a private equity firm. The acquisition is for $2.5 billion. Intel (INTC) and Microsoft (MSFT) are pushing the blue chips lower. Credit card companies, Visa (V), Mastercard (MA) and American Express (AXP) are stocks to watch. The companies have reportedly struck a deal with Apple (AAPL) to turn its iPhone into a mobile wallet. NBA Superstar Kevin Durant has signed a 20-year shoe contract with Nike (NKE). The new deal could be worth $350 million.