Breitbart has an e-mail allegedly sent by Joe McGinniss to Jesse Griffin, a third-rate anti-Palin blogger, and apparently one of McGinniss’s sources for The Rogue. Here are snippets:

From: Joe McGinniss To: Jesse Griffin Sent: Thursday, January 27, 2011 6:15 PM Subject: I have to ask you for help
Jesse–
Legal review of my manuscript is underway and here’s my problem: no one has ever offered documentation of any of the lurid stories about the Palins.
[. . . ]
Neither from you, the Enquirer, AlaskaWTF, palingates.com or anyone else, have I seen a credible, identified source backing any of the salacious stories about the Palin family.
Thus–as Random House lawyers are already pointing out to me–nothing I can cite other than my own reporting rises above the level of tawdry gossip. The proof is always just around the corner, but that’s a corner nobody has been able to turn. Maybe Jeff Dunn has, in which case I’ll be the first to congratulate him. But frankly, at this point, I’m tired of it, and I’ve run out of time.
No one has ever provided factual evidence that:
a) Todd had sex with a hooker, or with anyone else outside his marriage.
b) Sarah had an affair with Brad Hanson, or anyone else.
c) Track was a druggie who enlisted in the army to avoid a jail term. Or that he vandalized Wasilla school buses.
d) Willow was involved in the vandalism of the empty house in Meadow Lakes. Or that Sarah rushed back from Hawaii to put the lid on that.
e) Trig is not Sarah’s natural born child.
f) Bristol was promiscuous as a high schooler and drank and used drugs, or became pregnant again after Tripp’s birth.
Jesse, you were going on and on about Bristol being pregnant while doing Dancing With The Stars. And, if I recall correctly, at the time of her brief glossy-magazine-payday “reunion” with Levi, you surmised that she was pregnant by Ben Barber, or at least by someone who wasn’t Levi. You’ve recently suggested she’s had an abortion, publishing photographs that show her chubby then and thin now. But doesn’t that seem a little “thin” to you, based on nothing besides magazine pictures?
So much has bubbled at the salacious rumor stage for more than two years, but no one has been able to take even one story further.
Jesse, if you can put me in touch with people who are willing and able to substantiate any of the above, now is the time to do so. Otherwise, I hope you won’t complain that there are no startling new revelations in my book. My publisher and I think it’s damning enough without airing the family’s dirty laundry, but because Sarah’s hypocrisy about her family is one of the things that galls me most, I’d like to be able to publish facts in regard to a) through f) above, but I emphasize facts.
Not malicious speculation or third-hand rumors relayed by those who hold a grudge.
For any or all of those who’ve told you they’ll speak out, but not yet, now is the time. My book represents the last best chance to put the truth about Sarah in front of the American people in a documented, verifiable way. But I need facts that I can rely on. I didn’t live this long and work this hard over so many decades to wind up as AlaskaWTF between hard covers.

From what I’ve read, I can say that at least (a), (b), the first part of (c), and the first part of (f) made it into the book anyway, with little or no on-record corroboration offered. I haven’t read it all, so for all I know the rest of it could be in there as well. McGinniss says he “need[s] facts [he] can rely on,” but if this admittedly astonishing e-mail is the real deal, he appears to have failed to get them, and has gone instead with gossip he can profit from.