The assumption is that they're comparable with nothing that makes one stand out ("both somewhat bad"). In that case, sure, it could mean something. But you rarely see that situation, because it doesn't make sense to run against someone not very different from you.
I guess on the DNA level there is not much difference between any two candidates for any $job ... yet. The questions I'm asking are not about the current situation, they are about potential (not yet existing) situations we can find ourselves in with the advancement of DNA science.
