Per HuffPo, the less personally insulting part of his response was this:
"I've had a life which, on occasion, has had problems," Gingrich said. "I believe in a forgiving God, and the American people will have to decide whether that their primary concern. If the primary concern of the American people is my past, my candidacy would be irrelevant. If the primary concern of the American people is the future... that's a debate I'll be happy to have with your candidate or any other candidate if I decide to run."
Problem here, Newt, is that your past tells us some important things about you. For example, you don't learn from your mistakes. You can't govern your animal urges. Getting what you want is more important to you than keeping promises or basic moral conduct. You don't care much about other people, up to and including the person supposedly dearest to you.
Oh, and you lie like a freaking rug.
Sure, these things are in the past. But they would have a significant effect on our collective future if some freakish and frankly unimaginable chain of events landed you in the Oval Office.