Garbage take, and we're seeing it more and more. If you believe this, you've fallen hook, line, and sinker for the culture war politics pushed by the two parties. The Republicans claim to represent the "real working class backbone of America" or whatever they want to call it, as they continue to strip worker and environmental protections and push for tax cuts for the rich. They will not, and cannot "move left" solely because of their material basis as a party; both parties are bourgeois parties and will not move left on their own ever, and cannot be pushed left anytime soon.