The United Nations has long sought the ability to raise revenues in this manner as a means of reducing its reliance on American and other member nations' dues to sustain the UN's operations.
As a busker, one thing that does not work is self-consciousness. A busker needs to be working. A busker needs to shed all ego and get down to work. Play your songs, play them well, earn your money, and don't get in people's way.
The way to connect with voters on the plan is to simply give the facts. Fifty per cent of taxpayers pay 97 per cent of the taxes. By most people's standards, that's already fair. The President is playing the class warfare card because he knows that a lot of people may never hear that particular fact

