Stocks headed higher at the open, as bulls bet that this rally will last. The Dow rose 95 points, powered by a 10% gain for GM, while the S&P and Nasdaq added 1.5% and 2%, respectively. That came despite some negative economic news: Initial jobless claims rose 8,000 last week, and fourth-quarter GDP loss was revised to 6.3%, a pinch worse than the previous reading of 6.2%. (More stock market stories.)