Because, to millions of inbred conservative dimwits, "She's one of Us!"
That's true in ways they'll never appreciate.
Inbred, really? That's pretty weak.
I think you should stick to the traditional stereotypes when expressing your contempt for those that disagree with you. Hating people for their ideas and views is perfectly acceptable, and of course demonizing or belittling them is par for the course, but it's important to keep your target audience in mind.