I understand this - but I’m not sure the other usages can be stopped if in fact she’s an official candidate.
BUT - I’m not sure the other way either - I was just floating a thought from the back of my mind going back to media law courses.
I am not familiar with copyright law, but for public figures like Palin there are probably some uses of the name or image that can’t be prevented. For example, if Mad magazine wanted to do a Palin satire with Alfred E. Neuman made up to look like her on the cover, that’s probably protected free speech. But there are probably gray areas where protected speech verges into commercial exploitation.