Rick Santorum and his wife, Karen, gave 2.2 percent of their income to charity from 2007 to 2010, according to tax returns the candidate for the Republican presidential nomination released last night to Politico, a newspaper that covers politics.

The Santorums gave 1.8 percent of their $930,227 in total income to charity in 2010. In 2009, they donated 2.7 percent of their $1,127,266 total income.

The tax returns do not disclose the names of the organizations they supported.

The four years of returns show that the Santorums’ giving is about average for people in their income range who itemize their taxes.

Americans who make $500,000 to $1-million gave on average 2.6 percent of their total income to charity in 2009, the latest year for which the Internal Revenue Service has provided data. People who earn $1-million to $1.5-million gave on average 2.9 percent of their income…

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