pPeter Cardillo, chief market economist at Rockwell Global Capital, weighs in on fourth quarter GDP revised down to 2.4 percent from the initial 3.2 percent estimate reported in January, and why the U.S. stock market is rallying. ppIn afternoon trading, the Dow Jones industrial average climbed 117.32 points, or 0.72 percent, at 16,389.97. The S&P 500 Index rose 12.70 points, or 0.69 percent, at 1,866.99. The Nasdaq Composite Index was up 16.38 points, or 0.38 percent, at 4,335.26.