The tensions followed Mr. Christie to the annual meeting of the Republican Governors Association in Las Vegas last week. At a gathering where he had expected to be celebrated, Mr. Christie was repeatedly reminded of how deeply he had offended fellow Republicans.

“I will not apologize for doing my job,” he emphatically told one of them in a hotel hallway at the ornate Wynn Resort…

During a lengthy autopsy of their campaign, Mr. Romney’s political advisers pored over data showing that an unusually large number of voters who remained undecided until the end of the campaign backed Mr. Obama. Many of them cited the storm as a major factor in their decision, according to a person involved in the discussion.

“Christie,” a Romney adviser said, “allowed Obama to be president, not a politician.”…

“A lot of politicians look out for themselves,” said Mr. Gross, the Republican from Iowa. “They just usually camouflage it better.”