“She left that position voluntarily before her term was over. She quit.”
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Your penultimate sentence is correct. But that’s all. Sarah Palin has never quit in her life. You don’t understand what she did today.
Au contraire, she just did.
You don’t understand what she did today.
Yes, it's like quantum physics. It's way above my head, apparently. What exactly is it called in your world when someone leaves their job?