Even some GOP lawmakers on Capitol Hill are voicing their concerns about him and have been reluctant to endorse the former House speaker.
"I saw the damage he did to the Republican party and to the Congress. And I think I owe it to my constituents and to the country not to allow that to happen again," noted Rep. Peter King, R-N.Y.
"If he did that as speaker, I'm really concerned about what he would do as our nominee for president," he added.
As a member of Congress in the late 1990s, then representative and now Sen. Lindsey Graham, R-S.C., organized a failed attempt to oust Gingrich as speaker of the House.
Graham said he believes Gingrich has matured since then but still won't give his endorsement.
"I think he's leveled out as a person and all of us, even his worst critics, would say that Newt is a guy that can really hold a room," Graham said.
Gingrich's Republican critics say he had a million ideas as speaker, but many of those were a distraction.
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