One of the reasons such a conceptual plan draws support is that it's grounded in a reality that some reformers occasionally forget. Americans pay taxes on lots of things besides their income. Some taxes (sales taxes and payroll taxes) do take a higher share of income from lower and middle-income Americans. So a graduated income tax to balance that out seems fair to most voters, not to soak the rich but to make sure that all Americans are treated equally.
Bernie Sanders Champions YUGE Profits for U.S. Corporations (But Only in Cahoots with Communists) | Humberto Fontova