The man who once served as national manager of former President Bill Clinton's 1992 campaign plans to endorse Sen. Barack Obama, an aide to Obama said Wednesday.

Obama's campaign planned a 1 p.m. conference call Wednesday to announce the endorsement by David Wilhelm, who later became chairman of the Democratic National Committee, according to an aide who spoke on condition of anonymity because the announcement would be made public later in the day.

Wilhelm planned to tell reporters that Obama can build a coalition of Democrats, independents, and Republicans needed to win the 2008 general election versus potential republican nominee John MC Caine.

I think that's another blow to the Hillary Clinton campaign.