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Donald Trump had a "yuuuge" win in the New Hampshire Republican primary, and it was in part thanks to Chris Christie going after Marco Rubio during the GOP debate over the weekend, Charles Krauthammer said tonight.

Krauthammer said that Christie's "hit" on Rubio was a "suicide attack," because it didn't help the New Jersey governor, but instead the other candidates, particularly Trump.

"Now, you have a muddle among the so-called 'mainstream lane,'" Krauthammer explained. "It's easier to see four of them ... proceeding."

He said that if the mainstream candidates - Christie, Rubio, Jeb Bush and John Kasich - had been narrowed to one candidate, it would be approximately a three-man race between Trump, Ted Cruz and that one mainstream representative.

Watch more above.

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