FRANK RICH: The top 1 percent of American earners took in 23.5 percent of the nation’s pretax income in 2007 — up from less than 9 percent in 1976. During the boom years of 2002 to 2007, that top 1 percent’s pretax income increased an extraordinary 10 percent every year. But the boom proved an exclusive affair: in that same period, the median income for non-elderly American households went down and the poverty rate rose. It’s the very top earners, not your garden variety, entrepreneurial multimillionaires, who will be by far the biggest beneficiaries if there’s an extension of the expiring Bush-era tax cuts for income over $200,000 a year (for individuals) and $250,000 (for couples). […] Contrary to the popular perception, America’s superhigh earners are not mostly “superstars and celebrities in the arts, entertainment and sports” or the stars of law, medicine and real estate. They are instead corporate executives and managers — increasingly (and less surprisingly) financial company executives and managers, including those who escaped with outrageous fortunes as their companies imploded during the housing bubble. The G.O.P.’s arguments for extending the Bush tax cuts to this crowd, usually wrapped in laughably hypocritical whining about “class warfare,” are easily batted down. The most constant refrain is that small-business owners who file in this bracket would be hit so hard they could no longer hire new employees. But the Tax Policy Center found in 2008, when checking out similar campaign claims by “Joe the Plumber,” that only 2 percent of all Americans reporting small-business income, regardless of tax bracket, would see tax increases if Obama fulfilled his pledge to let the Bush tax cuts lapse for the top earners. The economist Dean Baker calculated that the yearly tax increase at the lower end of that bracket, for those with earnings between $200,000 and $500,000, would amount to $700 — which “isn’t enough to hire anyone.” MORE