Medicare for All:  Bernie Sanders has introduced the plan in the Senate, and it is supported by Cory Booker, Kirsten Gillibrand, Kamala Harris and Elizabeth Warren, who have all sponsored these bills, along with Rep. Tulsi Gabbard in the House.  Mayor Pete Buttigieg is also on record as being in favor of such a system.  The proposed plan would eliminate private insurance and transform Medicare into a single-payer system run entirely by the federal government.  Opponents, even within the Democratic Party, are wary, however, of banning health insurers from selling anything, as well as the total price tag.  The general estimate is a whopping $32 trillion.

Medicare for America:  Supported by Beto O’Rourke and possibly Kirsten Gillibrand.  This aims for universal coverage while giving workers the option of keeping their employer-sponsored plan or switching to a new and expanded version of Medicare.  The proposal rolls in anyone now on Medicare, Medicaid, ObamaCare-subsidized plans and the Childrens’ Health Insurance Program.  Plans offered by employers would have to match standards set under the proposed new program.

Medicare X Choice Act:  Sponsored by Senators Michael Bennet and Tim Kaine and in the House by Antoniuo Delgado, John Larson and Brian Higgins.  Among candidates, the plan is also supported by Beto O’Rourke, Amy Klobuchar, Pete Buttigieg, Kamala Harris and Cory Booker. The proposed plan leaves in the existing system and creates a public option (this was proposed during the debate over the Affordable Care Act and ultimately rejected).  The proposal, if approved, would also expand tax credits for purchase.

Medicare at 50 Act:  Supported by Cory Booker, Kamala Harris, Amy Klobuchar and Kirsten Gillibrand.  The proposal essentially allows U.S. citizens between the ages of 50 and 64 to buy a Medicare plan, and can use Obamacare subsidies to do so.