Those were the underlying themes of the riveting Hillary-Obama opening exchange (Hillary–tough, Obama–unifying, in case you were wondering). Obama seemed mad at times (has he seemed angry in any of the other debates?), and Hillary was glaring. Her voice dripped with scorn when she said Obama ”talks about stepping up.” Going to health care against both Obama and Edwards seems to indicate she’s going to use substance to the extent possible to counter-attack against both of them. Her line about Edwards taking lines out of the Republican play-book was well-recieved–a cheap way to push back in front of this kind of audience.