I agree that the lines between politicians  and celebrities have become blurred.  Don't forget, however, that those on the left welcome any left-leaning celebrities involvement:  Look to any awards ceremony held in 2016 for confirmation of this.   I realize endorsement is not the same as winning a senate or MP seat, but really we only have ourselves to blame.  

On the other hand, do not discount the Kid because he is an entertainer.  Schwarzenegger was one, too, and I believe Mr. "I'll be back" was a successful mayor.