This is a theme I've seen you bring up several times in the past: America is too big and diverse to be governed. I don't buy that, and I question why you keep bringing it up. To me, there seems to be only one group that seems to have a problem living in a pluralistic democracy where everyone should have a say in how it functions.
It's true that Democrats operate under a Big Tent with generally agreed-upon principles:
a) EQUALITY: Democracy is good/everyone should have a say. Don't be a dick to minority groups.
b) EDUCATION: Informed citizens make better decisions as citizens, are more innovative minds, and are better workers. They believe public education is the most efficient and equitable means of promoting those things.
c) ECONOMY: A well-regulated economy best serves the country by promoting worker rights, fair wages, and spreading some of the wealth for all.
d) ENVIRONMENT: If we don't protect the planet, none of the above matters.
Agreement on these broad principles is why Republican presidential candidates rarely win a majority of the popular vote nowadays. They want to advance the broader public good for everyone's advancement. It's a winning platform that multiple constituencies can get behind. The modern GOP, on the other hand, wants to hoard whatever hasn't gone to shit for a few narrow groups to the detriment of everyone else.