Presumptive Democratic presidential nominee Barack Obama and his wife Michelle each donated USD 2,300 to the campaign of his former rival Hillary Clinton, which is USD 22 million in debt.
In addition, Obama's national finance chairman, Penny Pritzker and her husband donated another USD 2,300 each, said Obama's communications director Robert Gibbs.
The USD 2,300 is the maximum individual contribution allowed under US laws.
“(Obama) wrote a check himself, as well as his finance chairman, so I got two checks in my pocket for Hillary,” said Clinton adviser Terry McAuliffe.
Asked how much the checks were for, he responded, “They maxed out.”
Gibbs confirmed the Obamas' donations, CNN reported.
The move comes nearly three weeks after Clinton suspended her campaign and endorsed 47 year-old Obama, who hopes to be the first black American president.
Earlier this week, Obama asked top contributors to help Clinton retire her campaign debt of USD 22 million, about 12 million of which she loaned to her own campaign.
The two Democrats met last night in Washington with her top fundraisers ahead of their planned joint appearance together at a rally in Unity, New Hampshire.
Clinton and Obama are now focused on uniting their party in order to defeat the Republicans in the November general election.