NEW YORK -- Wall Street tried to stage a comeback Thursday, with the Dow Jones industrials erasing much of a 209-point drop after an upbeat assessment of manufacturing activity eased some fears about a flagging U.S. economy. Just before 11:30 a.m. EDT, the Dow Jones industrial average was down 37.25, or 0.30 percent, at 12,231.38. Broader stock indicators also fell. The Standard & Poor's 500 index was down 3.67, or 0.26 percent, at 1,403.15, and the Nasdaq composite index was down 11.13, or 0.46 percent, at 2,405.02. Traders react after the close of trading on the floor of the New...