Democrats Fret Long Battle - Yahoo! News: "A senior Obama adviser, speaking on condition of anonymity, said Obama's team will respond to Tuesday's results by going negative on Clinton — raising questions about her tax records and the source of donations to the Clinton presidential library, among skeletons in the Clintons' past."
This is turning into a Republican's dream. Clinton got traction against Obama by negative campaigning, contributing to yesterday's wins in Ohio, Texas, and Rhode Island. But now Obama has little choice but to go negative against her in return. It is like a game of Prisoner's Dilemma where both players lose.