U.S. stocks rally at the open, led by Caterpillar By: MarketWatch February 09, 2010 at 09:51 AM EST U.S. stocks climbed rapidly on Tuesday, as investors guessed that a European bailout for Greece could be in the mix, broadly lifting stocks. Read More >> Related Stocks: Alcoa Caterpillar Coca-Cola Company Electronic Arts McDonald's Corp Standard & Poors 500