Yes, Newt Gingrich beat Mitt Romney to the punch by releasing his most recent tax returns. But Gingrich still hasn't disclosed how he earned most of his $3.1 million.
Gingrich's 2010 return shows that $2.4 million of his income came in regular payments, in addition to his salary, from different businesses he ran before announcing his candidacy for president.
Those businesses managed speaking engagements, appearance fees, consulting work, book and video deals, and paid positions that Gingrich held in other groups.
Gingrich doesn't identify where the money came from or the amounts he received from his consulting business.
His campaign hasn't decided whether it will release further information about Gingrich's income.
Other GOP presidential candidates, including Romney and Rick Santorum, have provided details of such income.