To most news Web sites, what happened at the White House on Thursday night was a private 50th birthday party for President Obama. To an editor at Fox News, it was something a little different. “Obama’s Hip-Hop BBQ Didn’t Create Jobs,” read the headline on an article on The Fox Nation,a conservative arm of FoxNews.com, which is owned by the News Corporation. Below the headline were photos of Mr. Obama and, separately, three black celebrities who attended the party, the basketball player Charles Barkley, the comedian Chris Rock and the rapper Jay-Z. Not pictured were any attendees of other racial...