Journalists are commonly denounced from all sides - a shameful, deceitful trade, a profession sold out to the powerful which gives a biased and misleading picture of the world. Behind the condemnation one can often detect a desire for reform, a feeling that good journalism is too important for the health of democracy to be left to languish among the tabloids. Yet the discussion rarely gets beyond the well-worn formulas of free speech and the Fourth Estate. The question of the political significance of journalism is never seriously addressed, and the question of what journalism should be is...