AC -- I agree that Hillary threw the kitchen sink at Obama. But I don't think this was the first time she tried to attack him. The difference is that the attacks finally started to resonate ...
I will say that her attacks this time around seemed more serious and fair (and issue-oriented) than the previous attacks. So that had something to do with it, too ...
Al Qaeda: We'll Strike The U.S. If You Execute The Boston Bomber
Hillary May Interview With FBI This Weekend
Hillary Clinton and Identity Politics