I think this is evidence you don't have any idea what's going on in the real world. Cain was never "dropped due to extramarital affairs" as you believe. You are totally and completely wrong about that. Several things factor into Cain's demise, the ALLEGED affairs are just one thing. More notably, is the way Cain handled it, many people felt he mishandled it from the start. Then there is the issue of Cain's policy depth, and whether he has the background experience to deal with crucial national security issues. The more the voters saw Cain struggle with those type of questions, and have moments of long pause, where he didn't seem to know what to say... the more they lost confidence in him, and I think that had far more to do with his fall than the trumped up and fake affairs bullshit.
Newt's baggage has been out there, we've known all about it for years. He admits it, owns it, and has repented for it, and now he is moving on to policy and staying on message. This old stuff isn't going to hurt him, because he is confident (and somewhat brilliant) on policy. You see, conservatives aren't as shallow and petty as dunderhead liberal dims, the man's personal life is not the biggest concern for us, we want a person who understands conservative principles, and can articulate them. But beyond that, we really want someone who can think on their feet, and put things in perspective in a 15 second sound bite, so that everyone can understand it. Newt is the master of that.