Top super PAC donors giving multimillions in 2012

6. James Simons. Total: $4 million

Simons is President of Euclidean Capital, a New York investment firm.

Simons gave $2 million to pro-Obama Priorities USA Action. He also gave $1.5 million to Majority PAC, which supports Democrats running for U.S. Senate, and $500,000 to House Majority PAC, which supports Democrats running for the U.S. House of Representatives.

7. Steve Mostyn & Amber Anderson. Total: $3.35 million

Mostyn and Anderson are married partners in the Mostyn Law Firm, in Houston.

Mostyn, the current president of the Texas Trial Lawyers Association, and his wife, who handles personal injury and wrongful death cases, gave a combined $2 million to pro-Obama Priorities USA Action, $1 million to the House Majority PAC, which supports Democrats running for the U.S. House of Representatives, $200,000 to Planned Parenthood Votes, and $125,000 to Texans For America's Future, which opposed Rick Perry's presidential run.

8. Robert Mercer. Total: $3.3 million

Mercer is co-CEO of Renaissance Technologies, a hedge fund in New York.

Mercer gave $1 million to pro-Romney Restore Our Future and $1 million to pro-Republican American Crossroads. He also gave $600,000 to Club For Growth Action, which advocates for lower taxes, $500,000 to Prosperity First, which opposes the re-election of Democratic New York Congressman Tim Bishop, Mercer's congressman, and $200,000 to National Horizon, which supports certain conservative candidates for Congress.

9. Fred Eychaner. Total: $3.25 million

Eychaner is President and CEO of Chicago-based Newsweb Corp., which owns newspapers and radio stations.

Eychaner gave $1.5 million to pro-Obama Priorities USA Action, $800,000 to pro-Senate Democrat Majority PAC, and $750,000 to pro-Democratic House Majority PAC. He also gave $200,000 to the America Votes Action Fund, which promotes progressive causes.

10. John Childs. Total: $3.125 million

Childs is CEO of the Florida investment firm J.W. Childs Associates.

Childs gave $1 million to pro-Romney Restore Our Future, $1 million to pro-Republican American Crossroads, and $1.125 million to Club For Growth Action, which advocates for lower taxes.