Americans support raising taxes on the rich by a two-to-one margin, with many believing an increase would both help the economy and make the tax system fairer, according to a Pew poll released Monday afternoon. Forty-four percent of adults surveyed said that raising taxes on incomes above $250,000 would help the economy and increase fairness, while 22 percent said it would hurt the economy and 21 percent that it would make the system less fair.