Citizen's United was the nail in the coffin for honest journalism, because it sold out to those with the largest wallets. If you truly want truth in journalism support independent journalists financially, and with your attention. Ignore corporate media.

How did Citizen's United affect journalism?

To me, the rules on how large a media conglomerate could get being changed in favor of allowing the conglomerate to grow even larger did some heavy lifting. Journalism publishers no longer have to compete since their all owned by the same limited number of owners.