Bernie Sanders has been asserting more forthrightly than any of his Democratic rivals that pretty much every domestic problem—from aging infrastructure to student debt to teenage acne—could be solved by raising taxes high enough on the super rich. Rarely do interviewers perform the public service of challenging his math, which is why the Vermont senator’s exchange Sunday with George Stephanopoulos of ABC News is noteworthy.
Mr. Sanders said that he is open to raising the current 39.6% top marginal income-tax rate to as high as 90%. The self-proclaimed “democratic socialist” also explained how he would increase the death tax “so that [Donald] Trump and his billionaire friends and their families will end up paying more.” Mr. Stephanopoulos replied that the numbers still don’t compute. “To pay for all of your programs, you’re going to have to do more than tax the top 1%,” he said. “How far below the top 1% are you going to go with tax hikes?”