1. American Bridge 21st Century Foundation - $1 million

2. George Soros, Soros Fund Management - $1 million

3. Anne G. Earhart, heiress to the Getty fortune - $850,000

4. American Federation of State, County and Municipal Employees - $575,000

5. Paul Egerman, Escription Inc. - $400,000

*Top donors for 2012 election cycle; numbers through Nov. 26, 2012.

Source: Center for Responsive Politics, Federal Election Commission