His multiple divorces, how he treated his wife that had cancer, etc, will bury him. He is the smartest guy in the room, but they will have a field day painting that picture and destroying him in the general election. He has no chance because of the personal choices he has made.
Just for your info, this is blatantly false and something I took as fact until this week.
Gingrich has been married three times. In 1962, he married Jackie Battley, his former high school geometry teacher, when he was 19 years old and she was 26. In the spring of 1980, Gingrich left Battley after having an affair with Marianne Ginther. In 1984, Battley told the Washington Post that the divorce was a "complete surprise" to her. According to Battley, in September 1980, Gingrich and their children visited her while she was in the hospital, recovering from surgery, and Gingrich wanted to discuss the terms of their divorce. Gingrich has disputed that account.
In 2011, their daughter, Jackie Gingrich Cushman, said that it was her mother who requested the divorce, that it happened prior to the hospital stay (which was for the removal of a benign tumor, not cancer), and that Gingrich's visit was for the purpose of bringing the couple's children to see their mother, not to discuss the divorce.