Jumping the shark is a colloquialism coined by Jon Hein and used by TV critics and fans to denote the point in a television program's history where the plot veers off into absurd story lines or out-of-the-ordinary characterizations. This usually corresponds to the point where a show with falling ratings apparently becomes more desperate to draw in viewers. In the process of undergoing these changes, the TV or movie series loses its original appeal. Shows that have "jumped the shark" are typically deemed to have passed their peak.

I'm not saying he has lost his political nerve or he's a poor President or anything like that...it's his celebrity that's fading; his spectacle.  He's on David Letterman and the talk show circuit.  He appears to have lost some of his original appeal; his approval rating has, at least at the moment, peaked.

Plus, I think I saw Ted McGinley behind the curtain in his latest press conference.