I was a strong Palin supporter at one time as well. In fact, I still have the McCain-Palin (with McCain cut-off) bumper sticker plastered on my rear bumper from last election.
But there is show business and there is politics and, at this point, I'd have to say that Sarah Palin has settled on her career in the former.
She stuck her toes in the water a little bit on Newt. There was no reward in Florida for doing it. I doubt she will endorse anyone, at least until there is one guy against Romney.
She may not do it then either. She has nothing to gain by endorsing anyone.