Wouldn't be surprised if this were just another Clintonian trick so she can play herself up as the Underdog. If Obamba is viewed as the front runner in the eyes of the media, they may be forced to render some (albeit token) critical coverage of him.
Both are claiming to be the underdog.
the idea that the frontrunner, the lady with more bagmen and corporate campaign cash than anyone else being the underdog is patently ridiculous.
She is only the underdog because people are deciding at a very fast rate that they like Obama a lot more