I think it breaks down by AGE. Elderly people are more likely to get the vaccine regardless of politics. Well the risk is there as well of course, and often the sacrifice of staying home most for the pandemic year, so it makes a lot of sense. So if all the Republicans one knows are collecting social security, it's likely to skew the sample. Younger people may be less likely to vote Republican in general, but come on, there exist younger Republicans too.
Weather or not it has FDA approval seems a pretty silly hill to die on to me. FDA approval is no guarantee of safety either, and I am convinced the vaccines (esp Pfizer/Moderna) are safe in the short term from the data we already have.
Those not getting vaccinated mostly hurt themselves (and who can care?), except that there are those who can't take vaccines maybe that are hurt, and medical personnel still have to care for these people, but then they have probably seen a fair amount of nonsense in their life (you swallowed what? uh that's not edible ...).