Joe, I agree with you about the likely (in)effectiveness of this kind of attack in a Democratic primary. What’s more, it may be more dangerous to the attacker than the attackee. I was talking yesterday to a high-ranking official from an organization that has endorsed Obama, who told me that their pollster had strenuously advised against putting up negative ads in Pennsylvania. Democratic voters still like both of the candidates, and may not look fondly on anything (or anyone) making it harder for whoever survives this process to win in November. (It’s worth noting the the Obama campaign stayed away from fanning the fire on Clinton’s Bosnia gaffe.) That Clinton is doing it anyway smacks of desperation.