Right, so is your point that everyone experiences bias?
I was not disputing we all have an internal bias built up by our experiences. The crux of that point is you try to minimise your own bias and try to further reduce that bias by including the bias of the remainder of society.
I don't think this is a terrible way to select a political candidate.
As an aside I don't understand how a political discussion could exist without bias. What is your model of politics that would allow it to exist without bias?