Actually reforms in the IRS are part of each candidates platform (see the IRS is affectable by the people through the politicians that the people vote for).

McCain wants to have a simpler system
Obama things the IRS should send out pre-filled out forms to most americans.
I forget what it is but Hillary has something

As for the "fair" tax nobody argues that it isn't simple. They oppose it because its progressive taxation the other way (taxes the poor more than the rich instead of our current model which taxes the rich more than the poor).

If you can come up with a tax that is that simple while still being progressive you might really have something.