New Jersey Gov. Chris Christie is going where Mitt Romney is not: a full-on attack on the newest challenger to Mr. Romney’s claim to the Republican nomination, Newt Gingrich.

Campaigning for the former Massachusetts governor in South Florida Thursday, Mr. Christie showed he may be the Romney attack dog.

“Speaker Gingrich has never run anything,” he told, a Scripps Howard website. “And he’s been a legislator. I have to tell you, I don’t think being a legislator is the best calling card. Look at the guy we have in the White House now. He never ran anything and was a legislator.”

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