RE: , but that position is the highest possible role for her, that is her peak office, a congressional seat.
The problem is not that she has been tried and found wanting for any higher office, it is that she has not been tried at all.
What a desperate thing to say, she has an office, and because of her similarity to Governor and vice-presidential candidate Palin, she got on plenty of national media, and she even got a presidential campaign.
She proved to be incompetent, flaky, and weak in striving to move into higher office, the same reasons she couldn't exploit all that publicity into gaining some power in the congress, she isn't executive material.