On the one side, the middle class and working class. On the other, the welfare class, the oligarchs who rely on crony capitalism and government support to make their money and keep down outsiders.
Trump has positioned himself on the side of the people who work for a living. Hillary, on the side of the rest.
“The US will soon be divided between those who work for a living, and those who don’t.”
That already happened; Romney alluded to it with the 47% comment. For the time being, low-wage earners are aligned with the non-working (in the hopes of bargaining for a better deal).