About a third of Senate Democrats — and most of the party's early presidential contenders — have signed on to Sen. Bernie Sanders' bill to establish a single-payer health care system.
Why it matters
“Single payer" is a catch-all term that means different things to different people. For most people, it just means cutting out private insurance companies, or at least minimizing their role. But the world's single-payer systems are not created equal, and the details — what's covered, how prices are set and how costs are spread across the system — make a huge difference.