Senator Hillary Clinton's campaign, ensuring the recent spat between the New York Senator and Senator Barack Obama will spill into its second week, held a conference call with reporters and national campaign co-chairman Tom Vilsack this afternoon. Vilsack, the former Governor of Iowa, said he was "very disappointed" in Obama for calling Clinton's foreign policy Bush-Cheney lite.

"It flies in the face of the promise Senator Obama gave to all of us of avoiding negative campaigning," Vilsack said. "It's not the Iowa way."

The rare Saturday get-together with reporters raised new questions about the disagreement between the two campaigns. For Clinton, holding a rare Saturday conference call with reporters made some question whether the argument is turning against the New York Senator after a week in which she won nearly every encounter with Obama.

For Obama, the argument throws his message of hope and a new approach to politics off track, as he engages in a traditional back-and-forth debate with another politician whose team, judging by the week just past, is far more advanced than his.

The Obama campaign did not immediately respond to messages left at their Chicago headquarters. But it is likely the Senator's team will hold their own response, making sure this debate continues into next week.