US President-elect Barack Obama has reportedly picked a former high-ranking Clinton administration aide to serve as the next attorney general, the country's top law enforcement official. Eric Holder, a former US attorney who served as the No. 2 official in the Justice Department under President Bill Clinton, would be the nation's first black attorney general. An Obama official and two Democrats in touch with the transition team confirmed Tuesday that Holder was Obama's top choice, but the Obama official said the decision was not final. Holder did not return messages seeking comment.