Recruiter, candidate relationships

What should the relationship be between a recruiter and the candidate? Stephen Harris over at Recruiting.com talks about the respect that should be shown both ways, something I completely agree with. Unfortunately the relationship is many time not like this, as we have all seen.

I think the whole area becomes more volatile when he recruiter is working on a contingency basis, as opposed to a retained search.

On the other side of the coin, what sort of relationship should an internal recruiter have with the candidate? I’m sure the recruiters (which I am not) out there have an opinion.