Mr. Davis says he is aware of the criticism, particularly since his representation of Ivory Coast became an issue. And he is pushing back with some of the same message-molding that earned him a label as a “spinmeister par excellence.” He says he’s lining up State Department officials, members of Congress and business leaders to testify about how much he has helped them.

Mostly, however, he’s single-handedly flooding the zone, writing long, detailed responses to reporters and columnists, and making himself available to anyone interested in directly hearing his side of his story.

“My credibility is the only thing I have,” he said in a long, emotional interview on Thursday. “If I defend people in indefensible, corrupt acts, then I lose everything I have, and I’m just another gun for hire. But when I see that I can help get out the facts, and improve people’s lives, and peacefully resolve conflicts, then I feel an obligation to do so.”

The 65-year-old native of Jersey City said his client list reflected his philosophy that everyone deserved a voice, particularly companies and causes that challenged conventional wisdom or the public’s sense of the politically correct. In his career, he has not only embraced controversy, but has also sought it out, portraying himself above all as a crisis manager committed to peacefully resolving conflicts.

That is essentially how Mr. Davis explains his decision to work for the self-declared president of Ivory Coast, Laurent Gbagbo, who has refused to accept that he lost his country’s presidential election this month, despite the sanctions and threats of force by his African neighbors.

“I felt great pressure that I could accomplish the avoidance of bloodshed by convincing this man to seek a fair hearing, and to stand down if the result didn’t go his way,” Mr. Davis said, referring to Mr. Gbagbo. Later, he added, “I thought I could do some good.”

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He similarly explained his work as one of three foreign agents for the government of Equatorial Guinea, which has been governed for three decades by Teodoro Obiang Nguema Mbasogo. Rights groups and anticorruption activists have accused Mr. Obiang of embezzling hundreds of millions of dollars from his tiny oil-rich West African state, while most of its people scrape by in dire poverty.

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“I’m a liberal Democrat,” Mr. Davis said, referring to his work for Mr. Obiang. “I’ve been a liberal Democrat all my life. I haven’t changed my values. But what am I supposed to do if the leader of a country comes to me and says he wants to get right with the world, and get right with the United States? Am I supposed to say no, and let him go on doing what he’s doing? Or should I try to help him get right?”

Obama administration officials say Mr. Davis is on the wrong side of some of these fights.

“Lanny is a relentless and effective interlocutor, but he cannot change the basic facts and interests that guide our foreign policy,” said the State Department spokesman Phillip J. Crowley. Referring respectively to leaders in Ivory Coast and Equatorial Guinea, he added, “President Gbagbo scheduled an election that he lost fair and square. That’s a fact. President Obiang has an abysmal human rights record. That’s a fact.”

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To be sure, his professional roster includes more clearly altruistic causes, such as the death-row inmate in California, Kevin Cooper, whom he has been helping, on a pro bono basis, to try to get clemency from the governor. “He is indefatigable — he works around the clock,” said Norman C. Hile, a California lawyer who is leading the clemency effort on Mr. Cooper’s behalf. “And he has been very persuasive in getting people to listen to our case.”

Regardless of the merits of the arguments Mr. Davis has made on behalf of his clients, he has come under unusually vociferous attacks in recent months, from a diverse array of advocates representing everyone from college students and mothers of poor children, to diplomats and international human rights advocates.

When advocates for poor women with infant children began to question if all the federally subsidized baby formula sold in the United States should include fatty acids known as DHA and ARA — which are supposed to make the formula more resemble breast milk — Mr. Davis was hired by Martek Biosciences, the Maryland-based company that makes the additives.

No one was arguing that these additives were dangerous, but there was debate as to whether they were effective.

Mr. Davis stepped in, sending around an e-mail on Capitol Hill claiming that the legislation that would have mandated more research on the additives was being pushed by “lactivists” who want to force women to continue breast-feeding. The provision was dropped.

More recently, Mr. Davis has taken up the fight on behalf of some of the largest for-profit colleges in the United States, which have been under attack for aggressive recruiting tactics. Critics say the colleges often leave students with excessive debt and degrees of limited value.

Mr. Davis has argued that these colleges are critical to Mr. Obama’s effort to increase higher-education opportunities, particularly for minority students.

Mr. Davis disagreed with his critics. And on Thursday, he had supporters call in with praise and flooded a reporter with e-mails of speeches he has given, comments he has made or the names of people who could speak on his behalf. He said that he was fighting back against Internet writers who ignored the facts, and a 24-hour news cycle that cared only about snappy sound bites.

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“Do I often find myself in a position of disputing facts that are not consistent with easy labels?” he said. “That’s what I do for a living. Controversy is what I do for a living.”