Top Spenders Lobbying ClientTotal US Chamber of Commerce$527,473,180 American Medical Assn$212,602,500 General Electric$191,270,000 AARP$169,752,064 American Hospital Assn$168,880,431 Pharmaceutical Rsrch & Mfrs of America$161,638,400 AT&T Inc$151,040,816 Northrop Grumman$144,414,935 National Assn of Realtors$132,797,380 Exxon Mobil$131,786,942 Edison Electric Institute$131,305,999 Business Roundtable$129,870,000 Blue Cross/Blue Shield$128,818,703 Verizon Communications$128,444,841 Lockheed Martin$118,735,633 Boeing Co$115,398,310 General Motors$106,261,483 Southern Co$100,970,694 Freddie Mac$96,194,048 Securities Industry & Financial Mkt Assn$95,353,143