She's not that stupid. She's cynical. She knows her district is chock-full of slack-jawed inbreds who will swallow any sort of bullshit, the wilder the better. Like Trump and the GOP in general, she has utter contempt for the stooges who put her in power. Every time she fucks them over, she just blames "them" - liberals, scientists, atheists, Jews, gay people: anybody who's Not One Of Us.
And the yokels believe it, so her contempt only grows. Rinse, repeat.