Gov Palin has let many things slide in the past but through her lawyers she is calling out McGinnis and RH on this one. It will serve as a great example for those who may be tempted in the future to play the same kind of games with her or her family.
Because this time, McGinnis' (confirmed) email to Griffen is the figurative "smoking gun" -- not only does it prove that McGinnis knew he could not substantiate his slime but published anyway, but because he reveals details of his discussions with Random House's lawyers to a third party, apparently he has waived attorney-client privilege and therefore huge amounts of documentation is open for discovery and the lawyers themselves can be compelled to testify.