But I don't think this is a workable task in a political system. The views of the guy you voted for are going to be different from the one you didn't vote for. In a perfect system every person will be impartial in evaluating elected officials. In the real world, if you evaluate the guy you DID NOT elect you would be perceived as being biased. On the other hand, if you evaluate the person you DID elect you would be perceived as being biased as well. Both cases you would be perceived as being biased. So the only workable approach is to focus less on individuals and more on the system and its results.