There's some explosive stuff about McCain in this front page NYT article today.  It covers various activities of questionable ethics by McCain over the years, starting with the Keating Five scandal, but the heart of the article is this story about an attractive young lobbyist McCain apparently was particularly fond of:

Mr. McCain’s confidence in his ability to distinguish personal friendships from compromising connections was at the center of questions advisers raised about Ms. Iseman.

The lobbyist, a partner at the firm Alcalde & Fay, represented telecommunications companies for whom Mr. McCain’s commerce committee was pivotal. Her clients contributed tens of thousands of dollars to his campaigns.

Mr. Black said Mr. McCain and Ms. Iseman were friends and nothing more. But in 1999 she began showing up so frequently in his offices and at campaign events that staff members took notice. One recalled asking, “Why is she always around?”

That February, Mr. McCain and Ms. Iseman attended a small fund-raising dinner with several clients at the Miami-area home of a cruise-line executive and then flew back to Washington along with a campaign aide on the corporate jet of one of her clients, Paxson Communications. By then, according to two former McCain associates, some of the senator’s advisers had grown so concerned that the relationship had become romantic that they took steps to intervene.

A former campaign adviser described being instructed to keep Ms. Iseman away from the senator at public events, while a Senate aide recalled plans to limit Ms. Iseman’s access to his offices.

In interviews, the two former associates said they joined in a series of confrontations with Mr. McCain, warning him that he was risking his campaign and career. Both said Mr. McCain acknowledged behaving inappropriately and pledged to keep his distance from Ms. Iseman. The two associates, who said they had become disillusioned with the senator, spoke independently of each other and provided details that were corroborated by others.

Separately, a top McCain aide met with Ms. Iseman at Union Station in Washington to ask her to stay away from the senator. John Weaver, a former top strategist and now an informal campaign adviser, said in an e-mail message that he arranged the meeting after “a discussion among the campaign leadership” about her.

“Our political messaging during that time period centered around taking on the special interests and placing the nation’s interests before either personal or special interest,” Mr. Weaver continued. “Ms. Iseman’s involvement in the campaign, it was felt by us, could undermine that effort.”

Mr. Weaver added that the brief conversation was only about “her conduct and what she allegedly had told people, which made its way back to us.” He declined to elaborate.

It is not clear what effect the warnings had; the associates said their concerns receded in the heat of the campaign.

Initially, McCain's campaign issued this lame rebuttal, attacking the NYT but notably silent in not denying any facts in the story:

“It is a shame that The New York Times has lowered its standards to engage in a hit-and-run smear campaign. John McCain has a 24-year record of serving our country with honor and integrity. He has never violated the public trust, never done favors for special interests or lobbyists, and he will not allow a smear campaign to distract from the issues at stake in this election.

“Americans are sick and tired of this kind of gutter politics, and there is nothing in this story to suggest that John McCain has ever violated the principles that have guided his career.”

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The Long Run

For McCain, Self-Confidence on Ethics Poses Its Own Risk

By JIM RUTENBERG, MARILYN W. THOMPSON, DAVID D. KIRKPATRICK and STEPHEN LABATON

Published: February 21, 2008

www.nytimes.com/2008/02/21/us/politics/21mccain.html

WASHINGTON — Early in Senator John McCain’s first run for the White House eight years ago, waves of anxiety swept through his small circle of advisers.

A female lobbyist had been turning up with him at fund-raisers, visiting his offices and accompanying him on a client’s corporate jet. Convinced the relationship had become romantic, some of his top advisers intervened to protect the candidate from himself — instructing staff members to block the woman’s access, privately warning her away and repeatedly confronting him, several people involved in the campaign said on the condition of anonymity.

When news organizations reported that Mr. McCain had written letters to government regulators on behalf of the lobbyist’s client, the former campaign associates said, some aides feared for a time that attention would fall on her involvement.

Mr. McCain, 71, and the lobbyist, Vicki Iseman, 40, both say they never had a romantic relationship. But to his advisers, even the appearance of a close bond with a lobbyist whose clients often had business before the Senate committee Mr. McCain led threatened the story of redemption and rectitude that defined his political identity.