I like the idea of a flat tax. I am not sure there are enough D voters who would support any plan that doesn't punish the evil rich people.

This is a part of their religion; to punish those who have plundered society and consumed extravagantly (in their minds).

The progressive tax isn't progressive enough for many of the Bernie supporters. The latest Bernie meme I saw, promoted that Bernie's tax plan would not raise taxes on anyone making less than $250k per year. Without getting into the truthfulness of that statement, I believe that in the minds of his suppporters, people who make over $250k per year are evil and proflegate and have not paid their fair share. The amount is arbitrary. For someone who has no job or makes minimum wage and pays little or no taxes, it is easy to argue that people making that much money should pay more.