Blogger: Traditionally, newspapers have taken objectivity to be an essential of good journalism.
Conclusion
The move from aiming for objectivity to aiming to create stir with partisan reporting is best understood in terms of differing business strategies.
Evidence
The new media outlets, who try to create a stir with partisan reporting, need to differentiate themselves in a crowded marketplace.
The old media outlets, who were aiming for objectivity, needed to avoid offending potential readers.
Evaluate
The structure of this argument is that Old vs. New can be explained by Goal 1 vs. Goal 2, which leaves us with two missing links to consider.
In order for the Old style (objectivity) to satisfy Goal 1 (avoid offending potential readers), the author needs to assume that objectivity is good at avoiding offending potential readers.
In order for the New style (create stir with open partisanship) to satisfy Goal 2 (differentiate themselves in crowded marketplace), the author needs to assume that creating a stir with openly partisan reporting helps to differentiate a news outlet in a crowded marketplace, i.e. it's not the case that everyone in this crowded marketplace is already doing this create a stir with openly partisan reporting strategy, because then it wouldn't serve the purpose of helping an outlet stick out from the crowd.
Goal
Look for either of the two missing links we found, or look for an answer ruling out some better explanation for understanding the contrast between Old and New journalistic standards.