I get your drift on the weakness of the question. He could have cited an example or something, as i don't really know what the precise definition of a "flake" is as it was used. I realize it is derogatory, but perhaps if someone doesn't know the meaning of "flake" they are one. (checks mirror)
I think she already has the "flake" vote cornered. So maybe FOX was trying to generate some sympathy for her by giving her a cringe moment and then show that she didn't cry or kick Chris Wallace in the nuts, either of which were potential outcomes.
Sometimes her eyes get that wild glassy look as if she is struggling to maintain control of her bowels, or maybe god is whispering sexual innuendos into her ear and she is not prepared for it.
Maybe Sarah will come out of the woods soon and help split the flake vote again. If she comes back from alaska with stone tablets or a trumpet, to be revealed in Iowa, i won't be one bit surprised, as i have come to expect that from the Moose Mama, Queen of the Tanning Bed. It is like they are vying for the Veep spot on the ticket, but the main herd can't pick the proper wacked out mouthpiece for the top of the ticket.