Marianne: Newt Not Fit to Lead

ABC News will air the interview with Newt's second wife, Marianne, tonight on Nightline. Here's a clip in which she describes him asking for an open marriage because he was seeing Callista. 

Newt Gingrich lacks the moral character to serve as President, his second ex-wife Marianne told ABC News, saying his campaign positions on the sanctity of marriage and the importance of family values do not square with what she saw during their 18 years of marriage.

She said Newt moved for the divorce just months after she had been diagnosed with Multiple Sclerosis, with her then-husband present.

"He also was advised by the doctor when I was sitting there that I was not to be under stress. He knew," she said.

Gingrich divorced his first wife, Jackie, as she was being treated for cancer. His relationship with Marianne began while he was still married to Jackie but in divorce proceedings, Marianne said.