Universal health care

In this March 5, 2020, photo, a Royal Mail employee wears gloves as he hold parcels and the signature handheld as he delivers in London. While white collar workers trying to avoid contagion can work from home or call in sick if they experience symptoms of the new virus, such precautions are not an options for the millions of waiters, delivery workers, cashiers, ride-hailing drivers, museum attendants and countless others who routinely come into contact with the public. (AP Photo/Frank Augstein)

Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks during a campaign event in San Antonio, Saturday, Feb. 22, 2020. (AP Photo/Eric Gay)

People arrive for caucus at Roosevelt Hight School, Monday, Feb. 3, 2020, in Des Moines, Iowa. (AP Photo/Andrew Harnik)

Democratic presidential candidates from left, Sen. Cory Booker, D-N.J., Rep. Tulsi Gabbard, D-Hawaii, Sen. Amy Klobuchar, D-Minn., South Bend, Ind., Mayor Pete Buttigieg, Sen. Elizabeth Warren, D-Mass., former Vice President Joe Biden, Sen. Bernie Sanders, I-Vt., Sen. Kamala Harris, D-Calif., former technology executive Andrew Yang and investor Tom Steyer wave to the audience before a Democratic presidential primary debate, Wednesday, Nov. 20, 2019, in Atlanta. (AP Photo/John Amis)

FILE - In a Monday, Nov. 4, 2019 file photo, Democratic presidential candidate Sen. Elizabeth Warren speaks during a town hall meeting at Grinnell College, in Grinnell, Iowa. Warren pushed back against critics of her newly-released plan to phase in implementation of a single-payer health care system, insisting Saturday, Nov. 16 that she is “fully committed” to Medicare for All and that she plans to first build on existing health care programs because “people need help right now.” (AP Photo/Charlie Neibergall, File)

Sen. Bernie Sanders, I-Vt., left, listens as former Vice President Joe Biden, right, responds to a question Thursday, Sept. 12, 2019, during a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

FILE - In this Sept. 3, 1949, file photo, Brigadier Gen. Wallace Harry Graham, right, personal physician of President Harry S. Truman checks his blood pressure in the president's office in Washington. Seventy years ago, before Medicare existed to inspire “Medicare for All,” a Democratic president wrestled with a challenge strikingly similar to what the party’s White House hopefuls face today. Harry Truman, then in his fourth year of pressing for a national health insurance system, parried criticism of his approach in terms that a single-payer health care advocate might use in 2019.(AP Photo/Henry Griffin, File)

In this June 27, 2019, photo, Democratic presidential candidate former Colorado Gov. John Hickenlooper speaks during the Democratic primary debate hosted by NBC News at the Adrienne Arsht Center for the Performing Arts, in Miami. It’s been tough to run for the Democratic presidential nomination as a moderate if your name isn’t Joe Biden. But some candidates hope that’s changing.(AP Photo/Wilfredo Lee)

Former Vice President Joe Biden greets supporters during the South Carolina Democratic Convention in Columbia, S.C. (Tracy Glantz/The State via AP)

Democratic presidential candidate Beto O'Rourke, right, runs the Capital City Pride Fest Fun Run 5K with his wife Amy, left, Saturday, June 8, 2019, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)