A few days after Hurricane Sandy shattered the shores of New Jersey, Gov. Chris Christie picked up the phone to take on a different kind of recovery work: taming the Republican Party fury over his effusive embrace of President Obama.

On Nov. 3, Mr. Christie called Rupert Murdoch, the influential News Corporation chief and would-be kingmaker, who had warned in a biting post on Twitter that the governor might be responsible for Mr. Obama’s re-election.

Mr. Christie told Mr. Murdoch that amid the devastation, New Jersey needed friends, no matter their political party, according to people briefed on the discussion. But Mr. Murdoch was blunt: Mr. Christie risked looking like a spoiler unless he publicly affirmed his support for Mitt Romney, something the governor did the next day.

Mr. Christie has been explaining himself to Republicans ever since. His lavish praise for Mr. Obama’s response to the storm, delivered in the last days of the presidential race, represented the most dramatic development in the campaign’s final stretch. Right or wrong, conventional wisdom in the party holds that it influenced the outcome.