Sales taxes hurt retirees / bums on welfare. Income taxes hurt working folks. It all depends on whose ox is being gored.
Retirees are people who have paid income tax their entire life (or at least 53% of retirees have). Their ox has already been gored. Their savings was taxed when they earned it as income. With a national sales tax, their savings when they spend it, will be taxed once again.
I say 13-13-0 with the zero being no sales tax.