1.   Because almost everyone loathes shuffling tax forms in April, flat tax proponents are getting lots of attention.

2.   Flat tax proponents say that wages that have been taxed should not be taxed again when, for example, the funds earn interest in a savings account.

3.   No matter what happens to Forbes, flat tax proponents said, the idea of a single tax rate will continue to gain favor.

4.   Tax cut proponents say that reducing the tax would spur investment and jump-start the economy.

5.   He also endorsed the Republican primary campaign of Steve Forbes, a prominent flat tax proponent.