everyone will have to agree exactly where all the people referred to (in the newspaper) fit in the categories, e.g.:
-- extreme left
-- liberal
-- moderate / center
-- conservative
-- extreme right
Person A can feel that Politician A is "moderate", while person B says they are "extreme ________". So if these people do the same study, they'll come up with, well, very different results.
And we'll all agree on this about the same time pigs sprout wings.
Tony