I was amazed (why?) watching the news teasers last night... They all but said that "an affair might effect McCain's chance at the White House before he was officially the nominee."
The NYT article the stories were referring to has a telling paragraph:
"...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..." (source)
If they had ANY credible knowledge or source claiming an impropriety by McCain they would have used it...instead they just imply it, with the buried disclaimer that "even the appearance" would be wrong.
Then the AP likens Cindy McCain to Hillary "standing by her man"... Yeah, except for the glaring difference that they was no dispute over whether Bill cheated, just over how many times...
**You can see how the Right'O'Sphere is feeling about McCain over at Right Wing News.