In 2007, when Washington Post blogger Ezra Klein founded JournoList, an online gathering place for several hundred liberal journalists, academics and political activists, he imagined a discussion group that would connect young writers to top sources. But in the heat of a bitter presidential campaign in 2008, the list’s discussions veered into collusion and coordination at key political moments, documents revealed this week by The Daily Caller show. In a key episode, JournoList members openly plotted to bury attention on then-candidate Barack Obama’s controversial pastor, the Rev. Jeremiah Wright. The Washington Independent’s Spencer Ackerman, for instance, suggested an effective tactic...