Romney’s top aides had demanded Christie step down as the state’s chief executive because if he didn’t, strict pay-to-play laws would have restricted the nation’s largest banks from donating to the campaign — since those banks do business with New Jersey.

But Christie adamantly refused to sacrifice his post, believing that being Romney’s running mate wasn’t worth the gamble.

“[Christie] felt, at one point, that [President] Obama could lose this. And, look, there still is that chance. But he knows, right now, you have to say it’s unlikely,” one source said.

The tough-talking governor believed Romney severely damaged his campaign by releasing only limited tax returns and committing several gaffes during his international tour in July.