Health insurance stocks sank, defying many analysts' expectations. ObamaCare will expand coverage of the uninsured in 2014, giving insurers millions of new customers. But the overhaul also imposes fees and restrictions on the companies, potentially threatening their profitability. Humana slid 7.9 percent, UnitedHealth Group 3.8 percent, Aetna 4.2 percent and Wellpoint 5.5 percent.With Obama seeking to restrain the growth of military spending, defense companies could struggle to win government contracts. Their stocks fell sharply: Lockheed Martin lost 3.9 percent, Northrop Grumman 4.6 percent and General Dynamics 3.9 percent. Among the 10 industry groups in the S&P 500 index, financial stocks and energy companies fell the most. Banks figure to face tougher regulation in a second Obama term than they would have under Romney. JPMorgan Chase fell 5.6 percent, Citigroup 6.3 percent, Bank of America 7.1 percent, Goldman Sachs 6.6 percent and Morgan Stanley 8.6 percent. The biggest losers were coal companies, which had hoped that a Romney administration would loosen mine safety and pollution rules that make it more costly for them to operate. Peabody Energy dived 9.6 percent, Consol Energy 6.1 percent, Alpha Natural Resources 12.2 percent and Arch Coal 12.5 percent. Oil companies fell less steeply. Trading also reflected the outcome of ballot measures decided in Tuesday's election. After two states approved the recreational use of marijuana for the first time, Medical Marijuana Inc., a company too small to be listed on major exchanges, surged 22 percent. Other notable moves included Apple, the world's most valuable company. It fell 3.8 percent to $558.00 and has dropped 20 percent from its all-time high of $705.07, reached Sept. 21. ___ AP Business Writers Christina Rexrode and Steve Rothwell in New York, Tom Murphy in Indianapolis, Linda Johnson in Trenton, N.J. and Marcy Gordon in Washington contributed to this report. Daniel Wagner can be reached at www.twitter.com/wagnerreports.