A major donor to President Barack Obama has been accused of defrauding a businessman and impersonating a bank official, creating new headaches for Obama's re-election campaign as it deals with the questionable history of another top supporter.

The New York donor, Abake Assongba, and her husband contributed more than $50,000 to Obama's re-election effort this year, federal records show. But Assongba is also fending off a civil court case in Florida, where she's accused of thieving more than $650,000 to help build a multimillion-dollar home in the state -- a charge her husband denies.

Obama is the only presidential contender this year who released his list of "bundlers," the financiers who raise campaign money by soliciting high-dollar contributions from friends and associates. But that disclosure has not come without snags; his campaign returned $200,000 last month to Carlos and Alberto Cardona, the brothers of a Mexican fugitive wanted on federal drug charges.