Letting people do it totally passively, however, could be bad. We know that people lean heavily towards default behavior when possible. So if the person you mirror starts deviating substantially from what you expect of them, you will be unlikely to change your preferences in a timely manner.

You could designate a group of people to set your vote for you (since we are sheep, we should call them wolves, but of course that doesn't strike the right emotional chord [except that it might foreshadow a foreseeable outcome of such a program]), and fall back on personal research if there isn't a majority or supermajority or whatever.