If Palin does decide to run, both she and her admirers would be wise to remember she is neither inevitable nor invincible. Hopefully, she’ll learn from the mistakes she made last time. If she wants to be a serious contender in 2012, there are some things she should start doing fairly soon. In fact, given the way she’s been dragged back into the national spotlight by an old man who can’t tell the difference between a TV studio and the pool table at a sleazy dive bar, she might want to get started now.