(CNN) - He's the fourth GOP hopeful to enjoy a surge in the polls, but Newt Gingrich thinks his frontrunner status will be longer lived than his rivals' bursts in the spotlight.
When asked Wednesday by CNN's Wolf Blitzer if it was possible he would make a blunder that would deflate his campaign, Gingrich acknowledged anything could happen.
"Is it possible? I guess," Gingrich said on CNN's "The Situation Room with Wolf Blitzer."
"On the other hand, I've had a very long career, I have a very public record, and I think people are coming to decide they like substance."
He continued, "I think there's probably a little more resilience in my support than in the other folks who made a run for it."
Gingrich, who's took harsh criticism this week from former colleagues in the House of Representatives, said he wasn't worried about "bruised feelings" that were left behind.
"I think in a legislative body there's a 'go along to get along' collegial attitude," Gingrich said. "I wasn't there as in a collegial job. I was there as a leader and my job was to drive through change that Washington wasn't comfortable with."
He said he thought he would be more effective as president knowing things he had learned during his time as Speaker of the House.
"Look, I wish everybody had loved me, but I'd rather be effective in representing the American people than be popular inside Washington," Gingrich said.
As to the charge he was focused on making money after leaving government consulting for groups like Freddie Mac, Gingrich said his company had done well through hard work, not exploiting government connections.
"Another way you could say it is that I'm as good a businessman as Mitt Romney," Gingrich responded when asked if he had "cashed in."
Responding to a question about the role of ethics in selecting a presidential candidate, Gingrich said voters would take a person's morals into account, but would also look to how a candidate has matured.
"I think everything about a candidate has to be held into account," Gingrich said. "I think you have to look and render judgment. Is this a person who has grown? Is this a person who has led a better life? I mean, I suspect everybody who runs for office at this level has had some flaws at some point. Other than Christ, I don't think anybody has been flawless."
Despite past ethical questions, like his three marriages and House ethics investigation, Gingrich said his own life was an example of personal growth.
"In my case I'm 68 years old. I have a very strong marriage to Callista, as you know. I'm very close to my two daughters. Callista and I have two wonderful grandchildren, Maggie and Robert, who are my debate coaches. And people have to look at all of that and decide is he now a person who's mature and who I'm comfortable having lead the country."
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