Stocks had their worst drop in more than three months as the prospect of political paralysis in Italy raised the specter of Europe's debt crisis flaring up again. The Dow Jones industrial average fell 216.40 points, or 1.6 percent, to 13,784.17, its biggest drop since Nov. 7. The Standard & Poor's 500 index fell 27.75 points, or 1.8 percent, to 1,487.85, dropping below 1,500 for the first time in three weeks. The Nasdaq composite dropped 45.57 points, or 1.4 percent, to 3,116.25.