I wish the Republican leadership in Congress would sponsor and actively pursue a bill to allow anyone who wants to to pay a voluntary extra income tax of 10% of their AGI. The names of those who do would mandatorily be a matter of public record for all to see, and by default, those who don’t would also be a matter of public record. This would be an excellent avenue for all the guilty liberals who say they ought to pay more in taxes to do so, or shut up. IIRC, the state of Maryland had something similar in the way of a voluntary extra tax, and it was spectacularly ignored. The key here is that it be a matter of public record who paid, and how much. A good payout from guilty liberals with wealth would yield some nice revenue for the feds. But the IRS couldn’t budget a good annual retreat with the actual expected revenues.
The House passed the ‘Buffet Rule Act of 2011’. It died in the Senate.