NEW YORK (AP) – Stocks are slumping for a second straight day as the market endures its most volatile stretch since February. The Dow Jones industrials fell 545 points, or 2.1 percent, to 25,052.83 and the benchmark S&P 500 dropped 57 points, or 2.1 percent, to 2,728.37. Both indexes have fallen more than 5 percent…… MORE