As far as I can tell, it doesn't, but having many records with the same bias over a significant period of time (as newspapers tend to do, though not always only

As far as I can tell, it doesn't, but having many records with the same bias over a significant period of time (as newspapers tend to do, though not always only one - Each columnist may have their own, but that's why there are bylines) can help you distill that out.