The underlying objective of Hucckabee and others like him, is to have everyone pay relatively the same amount in taxes. This would mean the poor would pay a larger proportion of their income in taxes than the rich. Granted, the rich tend to buy more, but the sum in terms of taxes will be relatively the same for essentials.
If the Republicans get this kind of thing through, America will become a third world country. The middle class will be washed away, unable to afford essentials, much less luxuries like education or medical care.