This is pure Marketing at it’s best …
It is up to the respective players to decide who wants to waste the money litigating against each other IF they disagree on the cover …
As far as I am concerned, so long as the name Sarah Palin is NOT copyrighted and those sets of photographs she took earlier for her book are NOT legally her and hers alone to possess, I do NOT see any wrong doing here …
Just some shrewd Fox News type marketing … !