Americans in the lower to middle income brackets are in pain these days because of energy costs – the surging per gallon price of gasoline hits a store clerk much harder than a megamillionaire Washington politician or a movie star. But leftists believe it's not hitting hard enough yet. How do we know? Former Obama Treasury official Mark Mazur told us so. In fact, as the gasoline prices in America reach levels never before seen, there's been discussion of a holiday from the federal gas tax – to cut the costs for consumers. No, said Mazur. That, in fact, "undercuts...