Jump the Shark
A term to describe a moment when something that was once valuable has reached a point where it is in decline both in quality and popularity.
Origin of this phrase comes from a Happy Days episode where the Fonz jumped a shark on waterskis. Thus was labeled the lowest point of the show.
(i.e. Cousin Oliver on Brady Bunch, or Scrappy Doo on Scooby Doo.)
In this particular case, the cabal has accepted defeat and is placing the joke that is Hillary's body double and campaign on full display in this comedic spoof. What a glorious exit strategy.