Four years after the fact? WTF else is it?
The problem the left, and the left-leaning media, have with Palin is that she's still popular amongst certain, non-consequential, right groups. So they simply keep pounding on her, I guess, because they can. She's an easy target to say "See? That's what's wrong with Republicans!!" For the most part, she's a less educated Obama. Plenty of style, little substance.