In an e-mail today to supporters, Obama wrote, "yesterday, I made my first donation to support this campaign," though he did not reveal the amount.
The amount: $5,000, according to the campaign.
Obama’s net worth is estimated between $2.8 million and $11.83 million, according to a database maintained by the Center for Responsive Politics.
Obama does not appear to have a record of contributing to other campaigns—not even his own failed Illinois congressional campaign against Bobby Rush in 2000.
It is unclear how millionaire Obama’s contribution will impact the Obama campaign’s class-based rhetoric.