For the first time, the FEC reports revealed many of the wealthy donors behind the SuperPACs.

Harold Simmons, a billionaire Dallas banker and chairman of Contran Corp, gave American Crossroads $5 million and Gingrich's group $500,000. Contran gave another $2 million to the Crossroads group.

Peter Thiel, billionaire co-founder of the payment service PayPal, gave the Super PAC backing Texas congressman Ron Paul $900,000.

Foster Freiss, a billionaire investor from Wyoming, founded the Red, White and Blue Fund that backs former US Sen Rick Santorum and donated $331,000.

Questions:

1. What groups are having a big impact in the US presidential election?

2. How are they helping candidates?

3. What are political action committees (PACs)?

Answers:

1. "Super PACs".

2. By raising more than $42 million to back Republican US presidential contenders in 2011.

3. Groups that are legally separate from the candidates they support and are allowed to accept unlimited donations.

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