What strikes me as odd about it (any of it, all of it!) is this: If Palin truly did keep the hoax from even her closest colleagues, and they believed that she gave birth to a baby only 4 days before, were they not curious about how she could humanly pull this off?
As The Leaky Wheel, who tipped me off to the peculiarities of this particular email said, how much milk do you have to pump to pull this off?
How much exhaustion can you shake off, how much effluvia can you emit before your body gives out? Before your husband (firstname.lastname@example.org) says "enough."
So, you might say, "Well, she wasn't pregnant. And her staff didn't know she wasn't pregnant."
Then I wonder why there was not the slightest scintilla of doubt in their emails beyond this could be "exhausting." Why there wasn't, "Is she sure she feels up to this? Can she really leave the baby this soon?"
And if she did give birth, what fear was driving her to not slow down for a second. Perhaps it was the "August is just around the corner; McCain is squarely in my camp" fear.