Washington Post: “President Obama and his wife, Michelle, despite having the second-lowest income of the four candidate/spouse combos, gave the highest percentage of their $ 1.8 million income to charity in 2010. He and Michelle gave 14.2% of their AGI, while the Romneys gave 13.8%.”

“Santorum and Newt Gingrich, by comparison, gave very little of their income to charity. Gingrich and his wife, Callista, gave 2.6% of their $ 3.2 million income in 2010. Santorum and wife Karen, who made the least in 2010 (less than $ 1 million), also gave the lowest percentage of their income to charity, at 1.8%.”

Paul Caron has charts detailing their charitable contributions,

Taegan Goddard’s Political Wire