That's a pretty big change to a catchy plan. GOP hopeful Herman Cain has altered his plan for 9 percent corporate income tax, 9 percent personal income tax, and 9 percent sales tax by dropping one of the numbers after being criticized that the proposal would raise levies on most Americans. While speaking in Detroit, he explained that he won't raise income tax on the poorest Americans. "If you are at or below the poverty level, your plan isn't 9-9-9. It's 9-0-9. Say amen, y'all," Cain said. In response to concerns that the government would be able to abuse the sales tax and make it higher, he said that since he'll be president (he's, uh, sure about that), he won't sign a bill that would do so.