A radical change which doubles taxes for most people is a losing proposition for any candidate to run on. That's what's wrong with it. There is an election coming up in 2012 and I'd like to keep Obama from winning it. Raising the taxes on most people isn't going to accomplish that.
The only people who would have their taxes “raised” under the Cain plan are those who pay no taxes currently. Tax the poor and let them pay for some of their own upkeep. Cain does not go far enough in my opinion. Those who pay no taxes shouldn’t be allowed to vote, in my opinion. Those with “no skin in the game” think it is perfectly fine to exist as parasites off of those who produce.