Good question. No, I don't think it is. This does not change the fact that one can have reasons for wanting to vote a particular way on a complex issue without personalities or a person's 'credentials', political or otherwise, playing a part in one's thinking.
I am certain, absolutely certain because I am such a person, that one can disagree with or dislike many things that a politician 'stands for', or appears to stand for, and still agree on an issue. The fact that one thinks a person's stance right (or wrong) on one issue, or even lots of issues, doesn't mean they are right (or wrong) about everything.
Anyway, the point was about bringing credentials into the picture and the point still remains that if you bring people's credentials (whatever they are) into an argument, you can't complain when someone else does too. That's what I was saying.