Brands want to be where the culture is going, not where it’s been. But most people live in the culture rather than profiting from it, and they experience the changing mores reflected in ads and movie casts as a shift in power that either excites or unnerves them. The result is that the Left feels a cultural and demographic power that it can only occasionally translate into political power, and the Right wields political power but feels increasingly dismissed and offended culturally.