Charity on the campaign trail

CNN Money-President Barack Obama and Oval Office hopefuls Newt Gingrich and Mitt Romney have all released at least one year of tax returns. And they all gave big money to charity.

President Barack Obama and Oval Office hopefuls Newt Gingrich and Mitt Romney have all released at least one year of tax returns. And they all gave big money to charity.

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"This is a huge percentage of his income," said Russell James III, a professor who teaches charitable planning at Texas Tech. "But when you look at the number as a percentage of his total assets, it's not that dramatic."

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