Barack Obama is being endorsed by fellow Sen. John Kerry, the Democrats’ 2004 presidential nominee who lost to President Bush that year with John Edwards as his running mate.

Besides any potential help for Obama, the endorsement is a slap at Edwards, Kerry’s former running mate.

The two had their differences during the campaign over strategy and spending, and Edwards has said he would have been more aggressive in challenging the unsubstantiated allegations of the Swift Boat Veterans for Truth questioning Kerry’s military record.