Investors seem to believe Fed Chairman Ben Bernanke's optimism: markets in New York rose the most in a month, ending a six-day downward spiral. By late afternoon, the Dow was up 236 points, the S&P 500 rebounded from a 12-year low yesterday, and the Russell 2000 jumped 4.6 percent. Traders are hoping there is more positive news to come. "If there's any kind of momentum in the market, people want to jump on board," said one manager. For the second day, bank shares led the rally, with Citigroup and Bank of America up more than 20 percent.