Barack Obama
University of California $927,568
Microsoft Corp $680,769
Google Inc $661,996
Harvard University $535,405
US Government $528,603

Mitt Romney
Goldman Sachs $965,140
Bank of America $844,734
Morgan Stanley $768,216
JPMorgan Chase & Co $749,918
Credit Suisse Group $588,841

Ron Paul
US Army $115,458
US Navy $92,350
US Air Force $90,611
Google Inc $42,478
US Dept of Defense $39,500

Newt Gingrich
Rock-Tenn Co $28,000
Las Vegas Sands $25,000
Poet LLC $22,500
Bay Area Surgical Management $17,500
Pull-A-Part Inc $15,000

(Source: opensecrets.org)