John Avlon says 40 billionaires ' pledge of fortune is inspiring act of U.S. exceptionalism . But he says it points up gap between the `` super rich '' and `` working wealthy '' couples . These $ 250k couples may be in Buffett tax bracket , but struggle to stay in upper-middle class . Comment: Working wealthy are n't suffering , but they pay high taxes , get few benefits .
John Avlon says 40 billionaires ' pledge of fortune is inspiring act of U.S. exceptionalism . But he says it points up gap between the `` super rich '' and `` working wealthy '' couples . These $ 250k couples may be in Buffett tax bracket , but struggle to stay in upper-middle class . Avlon : Working wealthy are n't suffering , but they pay high taxes , get few benefits .