There's been quite a lot written (mostly if not completely by right-leaning people) that celebrities are vain, out of touch, pampered, etc. Let's look at the list:
Ronald Reagan
Arnold Schwarzenegger
Sonny Bono
Fred Thompson
Clint Eastwood
All were elected on the Republican ticket. I can't think of any Hollywood celebrities who have been elected as a Democrat.
Then there was the circus sideshow in California when the role of Republican Governor was up for grabs. The casting call included the trapeze artist (this one took a bit of a stretch of the imagination) the midget and the strongman. The strongman won.
For the most part, people who vote Democrat know better than to elect an actor, but for the most part, people who vote Republican elect the same kind of person they claim to hate.