Would you be willing to abolish the current tax system in favor of this?

A National sales tax of 20% on everything except food, clothing, rent, mortage payments for primary residence only and any medical related issues such as perscriptions or doctors visits. The 20% would give 10% to federal, 5% to the state and 5% to local {city if you live in town, county if you do not}. No exemptions for anything, and cap the tax to only the first $5,000 of big ticket purchases.