Hollywood Republicans

"It makes sense that the Hollywood working class identifies with the Republican message. One screenplay sale can bump you to the highest tax bracket that year, but who knows when your next sale (if any) will be and how long you'll have to stretch that income out? Meanwhile, you've been branded as "rich," and a large chunk of your hard-earned money is for the taking, as you plan for a future career making lattes at Starbucks."

Income mobility.  The self-interested reason why people who aren't wealthy right now would support lower taxes for the upper percentiles.

(The other reason, of course, being that they think it's wrong to rob Peter to pay Paul.)