A national "sales tax" would:

1. Encourage savings - tax only applies when spent.
2. Most States already have a sales tax and have already implemented exemptions for necessities -ie food.
3. Lots of lobbyist would be out of business because - not much special interest involved
4. IRS & Tax lawyers, accountants also out of business OR likely change careers to be more productive for economy
5. Makes it more difficult to cheat. The so-called underground economy not paying would be captured.

It makes too much sense for Politicians to implement. If they actually solve problems, then their donor money gravy train ceases.