Candidate X doesn't know Y: What's your dealbreaker?

They need to know more than I do about both foreign and domestic policy issues. If I know more, they should be voting for me.

I’m not talking about positions or opinions on those issues, that isn’t what I think the OP was about. But if I’m listening and think that I have a better understanding of the issue, they will not get my vote.

I’m stealing this.