Roughly three-quarters of Medicare-for-all supporters believe that it could be paid for entirely by taxing billionaires. They’re wrong.

A recent poll by Echelon Insights found that 74 percent of voters who support the idea championed by Sen. Bernie Sanders (I-Vermont), Rep. Pramila Jayapal (D-Washington) and other progressive lawmakers think raising taxes only on billionaires would cover all of Medicare’s costs.