David Leonhardt has a great column in the New York Times about how the Patient Protection and Affordable Care Act attacks inequality:
A big chunk of the money to pay for the bill comes from lifting payroll taxes on households making more than $250,000. On average, the annual tax bill for households making more than $1 million a year will rise by $46,000 in 2013, according to the Tax Policy Center, a Washington research group. Another major piece of financing would cut Medicare subsidies for private insurers, ultimately affecting their executives and shareholders.
The benefits, meanwhile, flow mostly to households making less than four times the poverty level — $88,200 for a family of four people. Those without insurance in this group will become eligible to receive subsidies or to join Medicaid. (Many of the poor are already covered by Medicaid.) Insurance costs are also likely to drop for higher-income workers at small companies.
Finally, the bill will also reduce a different kind of inequality. In the broadest sense, insurance is meant to spread the costs of an individual’s misfortune — illness, death, fire, flood — across society. Since the late 1970s, though, the share of Americans with health insurance has shrunk. As a result, the gap between the economic well-being of the sick and the healthy has been growing, at virtually every level of the income distribution.
As I've been arguing, inequality is the central domestic policy divide between the two parties.