WALLACE: What? How do you guarantee -- I asked you this in the debate and I'm not sure I got a full answer, how do you guarantee that 9-9-9 down the line doesn't become 12-12-12?

CAIN: In the legislation that I'm going to ask Congress to send me, I want a two-thirds vote required by the Senate in order for them to change it. That will impede cavalierly raising it.

Secondly, the fact that the tax rate 9-9-9 is so visible, the American public is going to hold their feet to the fire and two-thirds majority in the Senate will be one of the ways to try to make sure that they don't raise it. And here's the other fact. As president, I am going to be working to bring down the debt. So, we're not going to have that tendency to continue to raise it because spending is out of control the way it is now. We will get spending under control at the same time that we grow this economy.