I think there is a difference between something that is misleading, as this usage probably is, vs. actionable misuse though. I tend to think of "misuse" in terms of violating the license under which the image was sold. I don't think this type of usage in any way violates the TOS. OTOH, it is perfectly fair game for a reporter to point out that it is being used deceptively by the candidate.
Sorry yes, that's what I meant. As usual Lisa has expressed my thoughts better than I could myself. I meant 'misuse' as deception rather than against the TOS.
I sell a lot of food images and therefore see many of my own images being used by hotels, restaurants, pubs, takeaways, etc. I guess that's a form of deception as the assumption of most customers would be that the establishments' own cooking was on display so, strictly speaking, they probably shouldn't be using them in the way that they are. Obviously I am perfectly happy for them to do so and if adherence to advertising standards was more heavily enforced then I probably wouldn't have much of a market for my work.