Specifically, Newt might have tried to negotiate an open relationship with wife #2 by telling her his current girlfriend would allow such a relationship, even if he never brought the topic up with the girlfriend, and he wouldn't tell his children about any of this.
"Open marriage" was Marianne's interpretation of what Newt was saying to her. If he didn't use that exact expression, he can say she misunderstood him.
OK guys... put up a picture of Marianne Gingrich next to a picture of Callista.... we should elect him for good sense and judgement.
I thought Newt had an open marriages for several years, but did not bother to tell his wives. What is not open about a mistress?