Palin's latest tweet:

"Critics are spinning, so hang in there as they feed false info on the right decision made as I enter last yr in office to not run again."

But she did not make an announcement that she will not run again. She announced that she's resigning very soon, without completing one term in office. That's a whole different thing. And it's why the decision is so bizarre. Everyone would have understood if she'd announced she would not be running for re-election. That happens in politics - if not for most partisan superstars. But this rushed sudden resignation must mean something else. Either she's totally unstable and did this on a whim, or we do not yet know the real reason.