Scott Jennings has become so much a part of CNN in recent months, one can argue, that he has become almost as familiar as anchors like Anderson Cooper and Jake Tapper. Even so, he doesn’t have to follow the same rules they do.

CNN says Jennings was well within his rights on Tuesday when he made a brief appearance at a rally-like event held in Michigan by President Donald Trump. In journalism circles, such stuff — curling up to an elected official and offering signs of support — is widely viewed as anathema. “Look at these farms,” Jennings said on stage. “I’ve got to get a farm in Michigan — because when you own as many libs as I do, you gotta get a place to put them all.” He later added on social media that he “got caught up in the moment,” and added a few well-placed emojis.

Funny stuff,...