Fox News titan Rupert Murdoch tweeted a warning shot at New Jersey Gov. Chris Christie -- get back onboard with Mitt Romney, or Obama's re-election will be on him.

Murdoch, after watching Christie and President Obama put politics aside and work together in the aftermath of Hurricane Sandy, tweeted that Christie "must re- declare for Romney, or take blame for next four dire years."

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Christie gave the keynote at the Republican National Convention and had been among Romney's most outspoken surrogates before the hurricane devastated New Jersey this week, and the federal government's quick response earned his appreciation.

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