The “9-9-9” plan that has helped propel businessman Herman Cain to the front of the GOP presidential field would stick many poor and middle-class people with a hefty tax increase while cutting taxes for those at the top, tax analysts say.The plan would do away with much of the current tax code and impose a 9 percent personal income tax, a 9 percent business tax and a 9 percent national sales tax, which tax experts say would mean that low- and middle-income Americans would pay more.“Right now, we have a strongly progressive income tax. High-income people are paying a higher...