Gingrich stepped down as Speaker after Republicans lost five seats in the 1998 midterms even as Clinton was embroiled in a sex scandal that led to his impeachment. Gingrich also received much of the blame for his handling of a budget fight that led to an extended government shutdown. Republicans who served with Gingrich have referred to him as occasionally disappointing as a leader and to his speakership as disorganized and inconsistent.
"I'm not inclined to be a supporter of Newt Gingrich's, having served under him for four years and experienced, personally, his leadership," Sen. Tom Coburn (R-Okla.) said in an interview on "Fox News Sunday." "I found it lacking, often times."
On Monday, Gingrich unveiled his first television ad of the campaign — targeting Iowa caucusgoers — while announcing a 50-state strategy to unseat Obama during a stop in New York to meet with businessman Donald Trump.
A 50-state approach might be ambitious for any presidential candidate — even for Romney, who polls the best against Obama in a hypothetical general election matchup, including among female voters and independents. But interviews with more than a half-dozen Republican operatives familiar with Gingrich's 33-year Washington career, among them longtime fans supportive of his presidential bid, suggest that such a strategy is particularly unrealistic for the ex-Speaker.
"One of the last things he has left to prove is that he can win a general election and that it would be beneficial for the party to have him at the top of the ticket," a Republican political strategist said. "Can he win women independents in suburban areas? I think he can — he represented a suburban district — but he's going to have to prove that."
The Gingrich campaign did not respond Monday to a request for comment. But longtime Gingrich backers defended the former Speaker, saying he has mellowed and matured with age since leaving office 13 years ago. They also argued that the 68-year-old deserves far more credit than he receives for what he achieved as Speaker, politically and for his executive leadership of the House.
These Republicans note that Gingrich took control of the chamber after Republicans had been in the minority for 40 years and constructed a team and systems to run the majority without the benefit of aides or committee chairmen with previous experience in charge. And Gingrich did more than develop conservative solutions to existing problems — an often-cited leadership quality — he built the bipartisan consensus needed to pass legislation and get it past President Bill Clinton's veto pen.
"Newt gets sold short in terms of his tenure as Speaker and the skills he brought to the job," said Dan Meyer, a partner at the Duberstein Group in Washington, D.C., who served as Gingrich's chief of staff in 1995 and 1996. "He motivated people to be a part of something bigger than themselves; he had an agenda."
Gingrich, since leaving office, has proved to be a savvy businessman with political staying power. He has been a prolific author and paid speaker, and until running for president he oversaw a web of profitable outfits engaged in conservative activism.
Former Sen. Scott Brown, R-Mass., candidate for U.S. Senate in New Hampshire, holds his hand over his heart during the singing of the national anthem as he waits to take the stage for his town hall campaign rally with Sen. John McCain at the Pinkerton Academy in Derry, N.H., on Monday, Aug. 18, 2014.