From NBC's Mark Murray
Chicago's Soldier Field hasn't seen a stiff arm like Hillary Clinton wielded tonight since the days Walter Payton played for the Bears. And if we were to give her stiff arm a nickname, we'd call it the George W. On nearly every question -- whether it was on Iraq, No Child Left Behind, NAFTA, or why lobbyists earn more money than average Americans -- Clinton responded by invoking Bush's presidency or record.
When you're up double digits in the polls, and when you receive tough questions, it's a great tactic to use. And to be fair, she isn't the only Dem who does this on tough questions. But she does it more than most.
At the end of the debate, Obama seemed to make a dig at Clinton's Bush references when he said, "It's not enough to change political parties." It's an argument that Obama, Edwards, and the other Dem candidates will have to make to strip the nomination away from her.