|"Welcome to my party, peasant."|
"You guys deserve it and I know Barack would personally love to see you there."
The "little celebration" for the president's birthday will take place at the family's home in Chicago on August 3.
The Obama campaign has become increasingly concerned that it will be out-spent by rival Mitt Romney ahead of November's presidential election.
Romney's campaign raised $106m in June compared to the $71m raised by Obama's team. The president's re-election campaign has warned supporters that they risk seeing the election lost unless they up their game