Guessing Game!

OK, Palin resigned so quickly that her staff thought she was just announcing she wouldn't run for re-election right up until her statement. She even sent out a Twitter about how she was going to not stand for re-elections a few minutes before she gave her statement...

Sorry kids, when a politician drops their office THIS quickly (and weirdly) there is usually a scandal they are attempting to evade, so let's all put on our thinking caps and try to figure out:

What is the scandal that caused Bible Spice to resign?