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A tale of two debate halves

From NBC/NJ's Erin McPike
There's a big difference in Mitt Romney's performance from the first half to the second half of the debate.

In the first, he was on fire -- firing away at both Giuliani and Huckabee on immigration and spending and striking blows.

During the second half, he's looked far less sure of himself, hesitating on the question about the Bible, twisting the question to fit his answer on black-on-black crime and trying to talk his way around whether gays should serve openly in the military.