This year, dozens of Democratic candidates ran — and won — on a promise to fight to give all Americans access to government-run health care. A new Medicare-for-all Caucus in the House already has 77 members. All the likely 2020 Democratic nominees support the idea, too.

“Medicare-for-all” has become a rallying cry on the left, but the term doesn’t capture the full scope of options Democrats are considering to insure all (or at least a lot more) Americans. Case in point: There are half a dozen proposals in Congress that envision very different health care systems.