This could be it for Hillary Clinton. Democratic primaries in South Dakota and Montana Tuesday are the last of the bunch and could be sufficient to push Senator Barack Obama over the top with a little bit of Superdelegate juice. The Senator's husband, former President Bill Clinton told crowds in South Dakota Monday that this could be the very last day he campaigns for a candidate. In a related story sources are saying that the Obama campaign is negotiating with Hillary Clinton, presumedly to get her to campaign for Obama this fall in exchange the presumptive nominee paying off some of the New York Senator's campaign estimated $40 million campaign debt.