You would only be able to deduct 25%. You would gain nothing. And the possibility of the IT rate CLIMBING, and CLIMBING every time they need a few dollars more to waste on stadiums, college entrances, 6th sports facility on a campus, 3rd swimming pool you would see a rise in the rate you were paying. Every pay raise you got they'd get more and more of your check. Even if the did away with the sales tax it would ONLY be temporary and you know it. Soon we'd be paying a 6% income tax and a 6% sales tax.
With a sales tax YOU control the amount they get. You have the option to avoid it by using the internet, garage sales, etc.
Even a 25% deduction in a 33% tax bracket is 8%. That would mean that for every dollar we pay the state in taxes, we save 8% of that in federal taxes. That's amounts to a nice chunk of change.
But I agree that they would keep raising the income tax and put the sales tax back in. We would lose much more than what we saved because the state would raise taxes and waste the funds.
It's well worth paying an extra 8%, to maintain the people's control on the legislature.