She didn’t have to “turn” on him. She just didn’t have to go out and actively campaign for someone who continuously compromises with liberals.
There is no question ignoring a campaign request from the McCain camp would have been perceived as a snub. The MSM would have had a field day with it. Right now, the Republicans appear as a very united party with their solidarity against Obamacare. That will really help them in November. They don't need something like a perceived Palin snub to give the impression of division. I question Hayworth's wisdom far more than Palin's.